31857342979 has 32 divisors (see below), whose sum is σ = 40740019200. Its totient is φ = 24191606400.

The previous prime is 31857342971. The next prime is 31857342983. The reversal of 31857342979 is 97924375813.

It is a cyclic number.

It is not a de Polignac number, because 31857342979 - 2³ = 31857342971 is a prime.

It is a super-3 number, since 3×31857342979³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31857342971) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 581874 + ... + 634264.

It is an arithmetic number, because the mean of its divisors is an integer number (1273125600).

Almost surely, 2^31857342979 is an apocalyptic number.

31857342979 is a deficient number, since it is larger than the sum of its proper divisors (8882676221).

31857342979 is a wasteful number, since it uses less digits than its factorization.

31857342979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52611.

The product of its digits is 11430720, while the sum is 58.

The spelling of 31857342979 in words is "thirty-one billion, eight hundred fifty-seven million, three hundred forty-two thousand, nine hundred seventy-nine".