313506509 has 2 divisors, whose sum is σ = 313506510. Its totient is φ = 313506508.

The previous prime is 313506499. The next prime is 313506527. The reversal of 313506509 is 905605313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248945284 + 64561225 = 15778^2 + 8035^2 .

It is a cyclic number.

It is not a de Polignac number, because 313506509 - 2⁸ = 313506253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313506569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156753254 + 156753255.

It is an arithmetic number, because the mean of its divisors is an integer number (156753255).

Almost surely, 2^313506509 is an apocalyptic number.

It is an amenable number.

313506509 is a deficient number, since it is larger than the sum of its proper divisors (1).

313506509 is an equidigital number, since it uses as much as digits as its factorization.

313506509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 32.

The square root of 313506509 is about 17706.1150171346. The cubic root of 313506509 is about 679.3321795633.

The spelling of 313506509 in words is "three hundred thirteen million, five hundred six thousand, five hundred nine".