23131199989 has 2 divisors, whose sum is σ = 23131199990. Its totient is φ = 23131199988.

The previous prime is 23131199953. The next prime is 23131200013. The reversal of 23131199989 is 98999113132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22961340900 + 169859089 = 151530^2 + 13033^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131199989 - 2¹⁵ = 23131167221 is a prime.

It is a super-2 number, since 2×23131199989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131199929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565599994 + 11565599995.

It is an arithmetic number, because the mean of its divisors is an integer number (11565599995).

Almost surely, 2^23131199989 is an apocalyptic number.

It is an amenable number.

23131199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131199989 is an equidigital number, since it uses as much as digits as its factorization.

23131199989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 944784, while the sum is 55.

The spelling of 23131199989 in words is "twenty-three billion, one hundred thirty-one million, one hundred ninety-nine thousand, nine hundred eighty-nine".