23131343211531 has 32 divisors (see below), whose sum is σ = 30941216221440. Its totient is φ = 15371276304384.

The previous prime is 23131343211523. The next prime is 23131343211539. The reversal of 23131343211531 is 13511234313132.

It is an interprime number because it is at equal distance from previous prime (23131343211523) and next prime (23131343211539).

It is not a de Polignac number, because 23131343211531 - 2³ = 23131343211523 is a prime.

It is a super-2 number, since 2×23131343211531² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23131343211492 and 23131343211501.

It is not an unprimeable number, because it can be changed into a prime (23131343211539) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7299254715 + ... + 7299257883.

It is an arithmetic number, because the mean of its divisors is an integer number (966913006920).

Almost surely, 2^{23131343211531} is an apocalyptic number.

23131343211531 is a deficient number, since it is larger than the sum of its proper divisors (7809873009909).

23131343211531 is a wasteful number, since it uses less digits than its factorization.

23131343211531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315.

The product of its digits is 19440, while the sum is 33.

Adding to 23131343211531 its reverse (13511234313132), we get a palindrome (36642577524663).

The spelling of 23131343211531 in words is "twenty-three trillion, one hundred thirty-one billion, three hundred forty-three million, two hundred eleven thousand, five hundred thirty-one".