31129912155 has 16 divisors (see below), whose sum is σ = 49997249280. Its totient is φ = 16539489888.

The previous prime is 31129912153. The next prime is 31129912181. The reversal of 31129912155 is 55121992113.

It is not a de Polignac number, because 31129912155 - 2¹ = 31129912153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31129912153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3941545 + ... + 3949434.

It is an arithmetic number, because the mean of its divisors is an integer number (3124828080).

Almost surely, 2^31129912155 is an apocalyptic number.

31129912155 is a deficient number, since it is larger than the sum of its proper divisors (18867337125).

31129912155 is a wasteful number, since it uses less digits than its factorization.

31129912155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7891250.

The product of its digits is 24300, while the sum is 39.

The spelling of 31129912155 in words is "thirty-one billion, one hundred twenty-nine million, nine hundred twelve thousand, one hundred fifty-five".