331506013 has 2 divisors, whose sum is σ = 331506014. Its totient is φ = 331506012.

The previous prime is 331505987. The next prime is 331506023. The reversal of 331506013 is 310605133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190798969 + 140707044 = 13813^2 + 11862^2 .

It is a cyclic number.

It is not a de Polignac number, because 331506013 - 2⁵ = 331505981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331506023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165753006 + 165753007.

It is an arithmetic number, because the mean of its divisors is an integer number (165753007).

Almost surely, 2^331506013 is an apocalyptic number.

It is an amenable number.

331506013 is a deficient number, since it is larger than the sum of its proper divisors (1).

331506013 is an equidigital number, since it uses as much as digits as its factorization.

331506013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 331506013 is about 18207.3065827980. The cubic root of 331506013 is about 692.0919589164.

The spelling of 331506013 in words is "three hundred thirty-one million, five hundred six thousand, thirteen".