231310320421591 has 2 divisors, whose sum is σ = 231310320421592. Its totient is φ = 231310320421590.

The previous prime is 231310320421513. The next prime is 231310320421627. The reversal of 231310320421591 is 195124023013132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231310320421591 - 2³¹ = 231308172937943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231310320421591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231310320421891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655160210795 + 115655160210796.

It is an arithmetic number, because the mean of its divisors is an integer number (115655160210796).

Almost surely, 2^{231310320421591} is an apocalyptic number.

231310320421591 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310320421591 is an equidigital number, since it uses as much as digits as its factorization.

231310320421591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 231310320421591 in words is "two hundred thirty-one trillion, three hundred ten billion, three hundred twenty million, four hundred twenty-one thousand, five hundred ninety-one".