31151972879 has 2 divisors, whose sum is σ = 31151972880. Its totient is φ = 31151972878.

The previous prime is 31151972857. The next prime is 31151972903. The reversal of 31151972879 is 97827915113.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31151972879 - 2³² = 26857005583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31151972879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31151972809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15575986439 + 15575986440.

It is an arithmetic number, because the mean of its divisors is an integer number (15575986440).

Almost surely, 2^31151972879 is an apocalyptic number.

31151972879 is a deficient number, since it is larger than the sum of its proper divisors (1).

31151972879 is an equidigital number, since it uses as much as digits as its factorization.

31151972879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 53.

The spelling of 31151972879 in words is "thirty-one billion, one hundred fifty-one million, nine hundred seventy-two thousand, eight hundred seventy-nine".