23131101997 has 2 divisors, whose sum is σ = 23131101998. Its totient is φ = 23131101996.

The previous prime is 23131101989. The next prime is 23131102021. The reversal of 23131101997 is 79910113132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22387939876 + 743162121 = 149626^2 + 27261^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131101997 - 2³ = 23131101989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131101967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565550998 + 11565550999.

It is an arithmetic number, because the mean of its divisors is an integer number (11565550999).

Almost surely, 2^23131101997 is an apocalyptic number.

It is an amenable number.

23131101997 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131101997 is an equidigital number, since it uses as much as digits as its factorization.

23131101997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The spelling of 23131101997 in words is "twenty-three billion, one hundred thirty-one million, one hundred one thousand, nine hundred ninety-seven".