31371172867 has 2 divisors, whose sum is σ = 31371172868. Its totient is φ = 31371172866.

The previous prime is 31371172823. The next prime is 31371172873. The reversal of 31371172867 is 76827117313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31371172867 is a prime.

It is not a weakly prime, because it can be changed into another prime (31371172967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15685586433 + 15685586434.

It is an arithmetic number, because the mean of its divisors is an integer number (15685586434).

Almost surely, 2^31371172867 is an apocalyptic number.

31371172867 is a deficient number, since it is larger than the sum of its proper divisors (1).

31371172867 is an equidigital number, since it uses as much as digits as its factorization.

31371172867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 46.

It can be divided in two parts, 3137117 and 2867, that added together give a square (3139984 = 1772²).

The spelling of 31371172867 in words is "thirty-one billion, three hundred seventy-one million, one hundred seventy-two thousand, eight hundred sixty-seven".