31916769631 has 4 divisors (see below), whose sum is σ = 32002337752. Its totient is φ = 31831201512.

The previous prime is 31916769613. The next prime is 31916769637. The reversal of 31916769631 is 13696761913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31916769631 is a prime.

It is a super-2 number, since 2×31916769631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31916769637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42783501 + ... + 42784246.

It is an arithmetic number, because the mean of its divisors is an integer number (8000584438).

Almost surely, 2^31916769631 is an apocalyptic number.

31916769631 is a deficient number, since it is larger than the sum of its proper divisors (85568121).

31916769631 is an equidigital number, since it uses as much as digits as its factorization.

31916769631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85568120.

The product of its digits is 1102248, while the sum is 52.

The spelling of 31916769631 in words is "thirty-one billion, nine hundred sixteen million, seven hundred sixty-nine thousand, six hundred thirty-one".