331521713 has 2 divisors, whose sum is σ = 331521714. Its totient is φ = 331521712.

The previous prime is 331521703. The next prime is 331521737. The reversal of 331521713 is 317125133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316412944 + 15108769 = 17788^2 + 3887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331521713 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (331521703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165760856 + 165760857.

It is an arithmetic number, because the mean of its divisors is an integer number (165760857).

Almost surely, 2^331521713 is an apocalyptic number.

It is an amenable number.

331521713 is a deficient number, since it is larger than the sum of its proper divisors (1).

331521713 is an equidigital number, since it uses as much as digits as its factorization.

331521713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 26.

The square root of 331521713 is about 18207.7377232868. The cubic root of 331521713 is about 692.1028844822.

Adding to 331521713 its reverse (317125133), we get a palindrome (648646846).

The spelling of 331521713 in words is "three hundred thirty-one million, five hundred twenty-one thousand, seven hundred thirteen".