231310222391 has 2 divisors, whose sum is σ = 231310222392. Its totient is φ = 231310222390.

The previous prime is 231310222357. The next prime is 231310222433. The reversal of 231310222391 is 193222013132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231310222391 - 2¹⁸ = 231309960247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231310242391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655111195 + 115655111196.

It is an arithmetic number, because the mean of its divisors is an integer number (115655111196).

Almost surely, 2^231310222391 is an apocalyptic number.

231310222391 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310222391 is an equidigital number, since it uses as much as digits as its factorization.

231310222391 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 231310222391 in words is "two hundred thirty-one billion, three hundred ten million, two hundred twenty-two thousand, three hundred ninety-one".