231960013 has 2 divisors, whose sum is σ = 231960014. Its totient is φ = 231960012.

The previous prime is 231959989. The next prime is 231960031. The reversal of 231960013 is 310069132.

Together with next prime (231960031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205148329 + 26811684 = 14323^2 + 5178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231960013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231960013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231960413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115980006 + 115980007.

It is an arithmetic number, because the mean of its divisors is an integer number (115980007).

Almost surely, 2^231960013 is an apocalyptic number.

It is an amenable number.

231960013 is a deficient number, since it is larger than the sum of its proper divisors (1).

231960013 is an equidigital number, since it uses as much as digits as its factorization.

231960013 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 25.

The square root of 231960013 is about 15230.2335175794. The cubic root of 231960013 is about 614.4280605993.

The spelling of 231960013 in words is "two hundred thirty-one million, nine hundred sixty thousand, thirteen".