31561400156 has 48 divisors (see below), whose sum is σ = 68303679360. Its totient is φ = 12545565120.

The previous prime is 31561400113. The next prime is 31561400161. The reversal of 31561400156 is 65100416513.

It is a super-2 number, since 2×31561400156² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1441166 + ... + 1462901.

It is an arithmetic number, because the mean of its divisors is an integer number (1422993320).

Almost surely, 2^31561400156 is an apocalyptic number.

It is an amenable number.

31561400156 is an abundant number, since it is smaller than the sum of its proper divisors (36742279204).

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

31561400156 is a wasteful number, since it uses less digits than its factorization.

31561400156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2904114 (or 2904112 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

Adding to 31561400156 its reverse (65100416513), we get a palindrome (96661816669).

The spelling of 31561400156 in words is "thirty-one billion, five hundred sixty-one million, four hundred thousand, one hundred fifty-six".