31927157979 has 4 divisors (see below), whose sum is σ = 42569543976. Its totient is φ = 21284771984.

The previous prime is 31927157959. The next prime is 31927157981. The reversal of 31927157979 is 97975172913.

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

It is a cyclic number.

It is not a de Polignac number, because 31927157979 - 2⁹ = 31927157467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31927157909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5321192994 + ... + 5321192999.

It is an arithmetic number, because the mean of its divisors is an integer number (10642385994).

Almost surely, 2^31927157979 is an apocalyptic number.

31927157979 is a deficient number, since it is larger than the sum of its proper divisors (10642385997).

31927157979 is a wasteful number, since it uses less digits than its factorization.

31927157979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10642385996.

The product of its digits is 7501410, while the sum is 60.

The spelling of 31927157979 in words is "thirty-one billion, nine hundred twenty-seven million, one hundred fifty-seven thousand, nine hundred seventy-nine".