231310119991 has 2 divisors, whose sum is σ = 231310119992. Its totient is φ = 231310119990.

The previous prime is 231310119973. The next prime is 231310120091. The reversal of 231310119991 is 199911013132.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231310119991 - 2¹¹ = 231310117943 is a prime.

It is a super-2 number, since 2×231310119991² (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 (231310119961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655059995 + 115655059996.

It is an arithmetic number, because the mean of its divisors is an integer number (115655059996).

Almost surely, 2^231310119991 is an apocalyptic number.

231310119991 is a deficient number, since it is larger than the sum of its proper divisors (1).

231310119991 is an equidigital number, since it uses as much as digits as its factorization.

231310119991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 40.

The spelling of 231310119991 in words is "two hundred thirty-one billion, three hundred ten million, one hundred nineteen thousand, nine hundred ninety-one".