31431323957 has 4 divisors (see below), whose sum is σ = 34288717056. Its totient is φ = 28573930860.

The previous prime is 31431323947. The next prime is 31431323981. The reversal of 31431323957 is 75932313413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31431323957 - 2⁴ = 31431323941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31431323947) 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, 1428696533 + ... + 1428696554.

It is an arithmetic number, because the mean of its divisors is an integer number (8572179264).

Almost surely, 2^31431323957 is an apocalyptic number.

It is an amenable number.

31431323957 is a deficient number, since it is larger than the sum of its proper divisors (2857393099).

31431323957 is a wasteful number, since it uses less digits than its factorization.

31431323957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857393098.

The product of its digits is 204120, while the sum is 41.

The spelling of 31431323957 in words is "thirty-one billion, four hundred thirty-one million, three hundred twenty-three thousand, nine hundred fifty-seven".