31901561497 has 16 divisors (see below), whose sum is σ = 37222416000. Its totient is φ = 27070831872.

The previous prime is 31901561491. The next prime is 31901561533. The reversal of 31901561497 is 79416510913.

It is a cyclic number.

It is not a de Polignac number, because 31901561497 - 2¹¹ = 31901559449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31901561491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1668997 + ... + 1688002.

It is an arithmetic number, because the mean of its divisors is an integer number (2326401000).

Almost surely, 2^31901561497 is an apocalyptic number.

It is an amenable number.

31901561497 is a deficient number, since it is larger than the sum of its proper divisors (5320854503).

31901561497 is a wasteful number, since it uses less digits than its factorization.

31901561497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357072.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 31901561497 in words is "thirty-one billion, nine hundred one million, five hundred sixty-one thousand, four hundred ninety-seven".