31631665431 has 4 divisors (see below), whose sum is σ = 42175553912. Its totient is φ = 21087776952.

The previous prime is 31631665421. The next prime is 31631665441. The reversal of 31631665431 is 13456613613.

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

It is an interprime number because it is at equal distance from previous prime (31631665421) and next prime (31631665441).

It is not a de Polignac number, because 31631665431 - 2¹¹ = 31631663383 is a prime.

It is a super-2 number, since 2×31631665431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31631665431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31631665421) 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, 5271944236 + ... + 5271944241.

It is an arithmetic number, because the mean of its divisors is an integer number (10543888478).

Almost surely, 2^31631665431 is an apocalyptic number.

31631665431 is a deficient number, since it is larger than the sum of its proper divisors (10543888481).

31631665431 is a wasteful number, since it uses less digits than its factorization.

31631665431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10543888480.

The product of its digits is 116640, while the sum is 39.

The spelling of 31631665431 in words is "thirty-one billion, six hundred thirty-one million, six hundred sixty-five thousand, four hundred thirty-one".