31640811125 has 64 divisors (see below), whose sum is σ = 49327349760. Its totient is φ = 19685736000.

The previous prime is 31640811119. The next prime is 31640811151. The reversal of 31640811125 is 52111804613.

It is not a de Polignac number, because 31640811125 - 2²⁶ = 31573702261 is a prime.

It is a super-2 number, since 2×31640811125² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31640811091 and 31640811100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5415956 + ... + 5421794.

It is an arithmetic number, because the mean of its divisors is an integer number (770739840).

Almost surely, 2^31640811125 is an apocalyptic number.

31640811125 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31640811125 is a deficient number, since it is larger than the sum of its proper divisors (17686538635).

31640811125 is a wasteful number, since it uses less digits than its factorization.

31640811125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435 (or 6425 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The spelling of 31640811125 in words is "thirty-one billion, six hundred forty million, eight hundred eleven thousand, one hundred twenty-five".