231612013 has 2 divisors, whose sum is σ = 231612014. Its totient is φ = 231612012.

The previous prime is 231611999. The next prime is 231612053. The reversal of 231612013 is 310216132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140256649 + 91355364 = 11843^2 + 9558^2 .

It is a cyclic number.

It is not a de Polignac number, because 231612013 - 2⁵ = 231611981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231612053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115806006 + 115806007.

It is an arithmetic number, because the mean of its divisors is an integer number (115806007).

Almost surely, 2^231612013 is an apocalyptic number.

It is an amenable number.

231612013 is a deficient number, since it is larger than the sum of its proper divisors (1).

231612013 is an equidigital number, since it uses as much as digits as its factorization.

231612013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 231612013 is about 15218.8045851177. The cubic root of 231612013 is about 614.1206398210.

Adding to 231612013 its reverse (310216132), we get a palindrome (541828145).

The spelling of 231612013 in words is "two hundred thirty-one million, six hundred twelve thousand, thirteen".