312500531591 has 2 divisors, whose sum is σ = 312500531592. Its totient is φ = 312500531590.

The previous prime is 312500531573. The next prime is 312500531593. The reversal of 312500531591 is 195135005213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312500531591 is a prime.

Together with 312500531593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312500531593) 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 as a sum of consecutive naturals, namely, 156250265795 + 156250265796.

It is an arithmetic number, because the mean of its divisors is an integer number (156250265796).

Almost surely, 2^312500531591 is an apocalyptic number.

312500531591 is a deficient number, since it is larger than the sum of its proper divisors (1).

312500531591 is an equidigital number, since it uses as much as digits as its factorization.

312500531591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20250, while the sum is 35.

The spelling of 312500531591 in words is "three hundred twelve billion, five hundred million, five hundred thirty-one thousand, five hundred ninety-one".