3,141,000

By the way, have you guys ever considered the possibility of Satoshi being a collective of people rather than one person? 
In mathematics there was this very influential guy named Nicolas Bourbaki who was later revealed never to have existed and to be a group of different individuals (https://en.wikipedia.org/wiki/Nicolas_Bourbaki).

I'd recommend Kraken in terms of safety, reputability and transaction costs

Ledger Nano S 

Depends on what you are trying to achieve:
As a fiat gateway to exchange fiat money with crypto in the first place of if you want to invest into large cap cryptocurrencies only I'd recommend Kraken in terms of reputability, safety and fees.
If you are looking for crypto/crypto trading the choice largely depends on the availability of the specific cryptocurrencies and tokens you are interested in.

In terms of fiat/crypto exchange my favourite definitely has to be Kraken.
When it comes to crypto/crypto pairs I like HitBTC except for their ludicrous withdrawal fees

Another episode underlining the importance and value of a blockchain approach to protect technology patents.
It appear as if China will never cease to remain both oblivious and malicious when it comes to respecting other peoples' intellectual property   

Gold, stocks, real estate
the options are manifold 

Wait for Ethos universal wallet to implement fiat gateway and credit card services

https://www.ethos.io/2018/08/04/live-community-qa-the-road-ahead

Learn how Ethos will bridge the traditional financial system with the blockchain in this live seminar with CEO and founder Shingo Lavine. 
Tonight Wed 8 Aug, 3pm PST/6pm EST/11pm GMT

Yeah it goes without saying that there are no risk free strategies when it comes to gambling. You should be aware that the main feature of a martingale strategy is concentrating the risk of a loss onto very improbable but in that case also quite catastrophic events 

It always constitutes a good idea to check the existence of postal adresses, corporate registries and also the legitimacy of team credentials such as LinkedIn profiles (which might be faked as well)

I still have faith in our messiah Vitalik of NazarETH 

Well, Martingale strategies typically require a large amount of small bets which might be easier implement in games with a lower minimum bet than roulette (such as dice games).
But I guess it is possible with roulette if you want to.

In the case of Ethos (I presume Trust should work similarly) you may derive your private keys from your 24-word passphrase using a BIP39 recovery tool which can be found here (https://support.ethos.io/support/solutions/articles/35000082707-how-to-use-the-bip39-recovery-tool) and is also provided by other parties independently of Ethos.
Having reconstructed your private keys (run the tool offline for extra security) you could then use them in several other wallets of your choice to access your funds.