231531454013 has 2 divisors, whose sum is σ = 231531454014. Its totient is φ = 231531454012.

The previous prime is 231531453977. The next prime is 231531454043. The reversal of 231531454013 is 310454135132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182159947204 + 49371506809 = 426802^2 + 222197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231531454013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231531454043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115765727006 + 115765727007.

It is an arithmetic number, because the mean of its divisors is an integer number (115765727007).

Almost surely, 2^231531454013 is an apocalyptic number.

It is an amenable number.

231531454013 is a deficient number, since it is larger than the sum of its proper divisors (1).

231531454013 is an equidigital number, since it uses as much as digits as its factorization.

231531454013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 231531454013 its reverse (310454135132), we get a palindrome (541985589145).

The spelling of 231531454013 in words is "two hundred thirty-one billion, five hundred thirty-one million, four hundred fifty-four thousand, thirteen".