23131013213317 has 2 divisors, whose sum is σ = 23131013213318. Its totient is φ = 23131013213316.

The previous prime is 23131013213257. The next prime is 23131013213327. The reversal of 23131013213317 is 71331231013132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21961913813316 + 1169099400001 = 4686354^2 + 1081249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23131013213317 is a prime.

It is a super-2 number, since 2×23131013213317² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23131013213327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11565506606658 + 11565506606659.

It is an arithmetic number, because the mean of its divisors is an integer number (11565506606659).

Almost surely, 2^{23131013213317} is an apocalyptic number.

It is an amenable number.

23131013213317 is a deficient number, since it is larger than the sum of its proper divisors (1).

23131013213317 is an equidigital number, since it uses as much as digits as its factorization.

23131013213317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

Adding to 23131013213317 its reverse (71331231013132), we get a palindrome (94462244226449).

The spelling of 23131013213317 in words is "twenty-three trillion, one hundred thirty-one billion, thirteen million, two hundred thirteen thousand, three hundred seventeen".