131231232113 has 2 divisors, whose sum is σ = 131231232114. Its totient is φ = 131231232112.

The previous prime is 131231232073. The next prime is 131231232137. The reversal of 131231232113 is 311232132131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130210557409 + 1020674704 = 360847^2 + 31948^2 .

It is a cyclic number.

It is not a de Polignac number, because 131231232113 - 2²⁶ = 131164123249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131231132113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65615616056 + 65615616057.

It is an arithmetic number, because the mean of its divisors is an integer number (65615616057).

Almost surely, 2^131231232113 is an apocalyptic number.

It is an amenable number.

131231232113 is a deficient number, since it is larger than the sum of its proper divisors (1).

131231232113 is an equidigital number, since it uses as much as digits as its factorization.

131231232113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

Adding to 131231232113 its reverse (311232132131), we get a palindrome (442463364244).

The spelling of 131231232113 in words is "one hundred thirty-one billion, two hundred thirty-one million, two hundred thirty-two thousand, one hundred thirteen".