31977677957 has 4 divisors (see below), whose sum is σ = 32121075840. Its totient is φ = 31834280076.

The previous prime is 31977677933. The next prime is 31977677971. The reversal of 31977677957 is 75977677913.

It is a happy number.

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 31977677957 - 2¹⁰ = 31977676933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31977677987) 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, 71698607 + ... + 71699052.

It is an arithmetic number, because the mean of its divisors is an integer number (8030268960).

Almost surely, 2^31977677957 is an apocalyptic number.

It is an amenable number.

31977677957 is a deficient number, since it is larger than the sum of its proper divisors (143397883).

31977677957 is a wasteful number, since it uses less digits than its factorization.

31977677957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143397882.

The product of its digits is 122523030, while the sum is 68.

The spelling of 31977677957 in words is "thirty-one billion, nine hundred seventy-seven million, six hundred seventy-seven thousand, nine hundred fifty-seven".