231311111310997 has 2 divisors, whose sum is σ = 231311111310998. Its totient is φ = 231311111310996.

The previous prime is 231311111310971. The next prime is 231311111311073. The reversal of 231311111310997 is 799013111113132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214014487426756 + 17296623884241 = 14629234^2 + 4158921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311111310997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231311111317997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115655555655498 + 115655555655499.

It is an arithmetic number, because the mean of its divisors is an integer number (115655555655499).

Almost surely, 2^{231311111310997} is an apocalyptic number.

It is an amenable number.

231311111310997 is a deficient number, since it is larger than the sum of its proper divisors (1).

231311111310997 is an equidigital number, since it uses as much as digits as its factorization.

231311111310997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 43.

The spelling of 231311111310997 in words is "two hundred thirty-one trillion, three hundred eleven billion, one hundred eleven million, three hundred ten thousand, nine hundred ninety-seven".