31196913657 has 32 divisors (see below), whose sum is σ = 51216372480. Its totient is φ = 16448624640.

The previous prime is 31196913641. The next prime is 31196913697. The reversal of 31196913657 is 75631969113.

It is a happy number.

It is not a de Polignac number, because 31196913657 - 2⁴ = 31196913641 is a prime.

It is a super-2 number, since 2×31196913657² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31196913697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 665569 + ... + 710897.

It is an arithmetic number, because the mean of its divisors is an integer number (1600511640).

Almost surely, 2^31196913657 is an apocalyptic number.

It is an amenable number.

31196913657 is a deficient number, since it is larger than the sum of its proper divisors (20019458823).

31196913657 is a wasteful number, since it uses less digits than its factorization.

31196913657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47873.

The product of its digits is 918540, while the sum is 51.

The spelling of 31196913657 in words is "thirty-one billion, one hundred ninety-six million, nine hundred thirteen thousand, six hundred fifty-seven".