1211942650 has 12 divisors (see below), whose sum is σ = 2254213422. Its totient is φ = 484777040.

The previous prime is 1211942609. The next prime is 1211942651. The reversal of 1211942650 is 562491121.

It can be written as a sum of positive squares in 3 ways, for example, as 1179304281 + 32638369 = 34341^2 + 5713^2 .

It is not an unprimeable number, because it can be changed into a prime (1211942651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12119377 + ... + 12119476.

Almost surely, 2^1211942650 is an apocalyptic number.

1211942650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211942650 is a deficient number, since it is larger than the sum of its proper divisors (1042270772).

1211942650 is a wasteful number, since it uses less digits than its factorization.

1211942650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24238865 (or 24238860 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1211942650 is about 34812.9666934606. The cubic root of 1211942650 is about 1066.1722051773.

The spelling of 1211942650 in words is "one billion, two hundred eleven million, nine hundred forty-two thousand, six hundred fifty".