31109990156 has 24 divisors (see below), whose sum is σ = 62861428896. Its totient is φ = 13195399680.

The previous prime is 31109990129. The next prime is 31109990173. The reversal of 31109990156 is 65109990113.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5724455 + ... + 5729886.

It is an arithmetic number, because the mean of its divisors is an integer number (2619226204).

Almost surely, 2^31109990156 is an apocalyptic number.

It is an amenable number.

31109990156 is an abundant number, since it is smaller than the sum of its proper divisors (31751438740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31109990156 is a wasteful number, since it uses less digits than its factorization.

31109990156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11454449 (or 11454447 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 44.

The spelling of 31109990156 in words is "thirty-one billion, one hundred nine million, nine hundred ninety thousand, one hundred fifty-six".