231304120391 has 2 divisors, whose sum is σ = 231304120392. Its totient is φ = 231304120390.

The previous prime is 231304120339. The next prime is 231304120457. The reversal of 231304120391 is 193021403132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231304120391 - 2¹⁴ = 231304104007 is a prime.

It is a super-2 number, since 2×231304120391² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231304120331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115652060195 + 115652060196.

It is an arithmetic number, because the mean of its divisors is an integer number (115652060196).

Almost surely, 2^231304120391 is an apocalyptic number.

231304120391 is a deficient number, since it is larger than the sum of its proper divisors (1).

231304120391 is an equidigital number, since it uses as much as digits as its factorization.

231304120391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 231304120391 in words is "two hundred thirty-one billion, three hundred four million, one hundred twenty thousand, three hundred ninety-one".