23131040981 has 2 divisors, whose sum is σ = 23131040982. Its totient is φ = 23131040980.

The previous prime is 23131040963. The next prime is 23131041049. The reversal of 23131040981 is 18904013132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23106736081 + 24304900 = 152009^2 + 4930^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131040981 - 2³⁰ = 22057299157 is a prime.

It is a super-2 number, since 2×23131040981² (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 (23131040921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565520490 + 11565520491.

It is an arithmetic number, because the mean of its divisors is an integer number (11565520491).

Almost surely, 2^23131040981 is an apocalyptic number.

It is an amenable number.

23131040981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131040981 is an equidigital number, since it uses as much as digits as its factorization.

23131040981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 23131040981 in words is "twenty-three billion, one hundred thirty-one million, forty thousand, nine hundred eighty-one".