231402013 has 2 divisors, whose sum is σ = 231402014. Its totient is φ = 231402012.

The previous prime is 231401999. The next prime is 231402019. The reversal of 231402013 is 310204132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139759684 + 91642329 = 11822^2 + 9573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231402013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231402019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115701006 + 115701007.

It is an arithmetic number, because the mean of its divisors is an integer number (115701007).

Almost surely, 2^231402013 is an apocalyptic number.

It is an amenable number.

231402013 is a deficient number, since it is larger than the sum of its proper divisors (1).

231402013 is an equidigital number, since it uses as much as digits as its factorization.

231402013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231402013 is about 15211.9036612779. The cubic root of 231402013 is about 613.9349782780.

Adding to 231402013 its reverse (310204132), we get a palindrome (541606145).

The spelling of 231402013 in words is "two hundred thirty-one million, four hundred two thousand, thirteen".