23311031291 has 2 divisors, whose sum is σ = 23311031292. Its totient is φ = 23311031290.

The previous prime is 23311031273. The next prime is 23311031309. The reversal of 23311031291 is 19213011332.

It is a balanced prime because it is at equal distance from previous prime (23311031273) and next prime (23311031309).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23311031291 is a prime.

It is a super-2 number, since 2×23311031291² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23311031291.

It is not a weakly prime, because it can be changed into another prime (23311031221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11655515645 + 11655515646.

It is an arithmetic number, because the mean of its divisors is an integer number (11655515646).

Almost surely, 2^23311031291 is an apocalyptic number.

23311031291 is a deficient number, since it is larger than the sum of its proper divisors (1).

23311031291 is an equidigital number, since it uses as much as digits as its factorization.

23311031291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 26.

The spelling of 23311031291 in words is "twenty-three billion, three hundred eleven million, thirty-one thousand, two hundred ninety-one".