331309313 has 2 divisors, whose sum is σ = 331309314. Its totient is φ = 331309312.

The previous prime is 331309309. The next prime is 331309387. The reversal of 331309313 is 313903133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273670849 + 57638464 = 16543^2 + 7592^2 .

It is a cyclic number.

It is not a de Polignac number, because 331309313 - 2² = 331309309 is a prime.

It is not a weakly prime, because it can be changed into another prime (331309513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165654656 + 165654657.

It is an arithmetic number, because the mean of its divisors is an integer number (165654657).

Almost surely, 2^331309313 is an apocalyptic number.

It is an amenable number.

331309313 is a deficient number, since it is larger than the sum of its proper divisors (1).

331309313 is an equidigital number, since it uses as much as digits as its factorization.

331309313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 26.

The square root of 331309313 is about 18201.9041036920. The cubic root of 331309313 is about 691.9550469479.

The spelling of 331309313 in words is "three hundred thirty-one million, three hundred nine thousand, three hundred thirteen".