23311131997 has 2 divisors, whose sum is σ = 23311131998. Its totient is φ = 23311131996.

The previous prime is 23311131989. The next prime is 23311132001. The reversal of 23311131997 is 79913111332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23209303716 + 101828281 = 152346^2 + 10091^2 .

It is a cyclic number.

It is not a de Polignac number, because 23311131997 - 2³ = 23311131989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23311131197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11655565998 + 11655565999.

It is an arithmetic number, because the mean of its divisors is an integer number (11655565999).

Almost surely, 2^23311131997 is an apocalyptic number.

It is an amenable number.

23311131997 is a deficient number, since it is larger than the sum of its proper divisors (1).

23311131997 is an equidigital number, since it uses as much as digits as its factorization.

23311131997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The spelling of 23311131997 in words is "twenty-three billion, three hundred eleven million, one hundred thirty-one thousand, nine hundred ninety-seven".