313608209 has 4 divisors (see below), whose sum is σ = 315233316. Its totient is φ = 311983104.

The previous prime is 313608199. The next prime is 313608223. The reversal of 313608209 is 902806313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 135652609 + 177955600 = 11647^2 + 13340^2 .

It is a cyclic number.

It is not a de Polignac number, because 313608209 - 2⁴ = 313608193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (313608409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812264 + ... + 812649.

It is an arithmetic number, because the mean of its divisors is an integer number (78808329).

Almost surely, 2^313608209 is an apocalyptic number.

It is an amenable number.

313608209 is a deficient number, since it is larger than the sum of its proper divisors (1625107).

313608209 is a wasteful number, since it uses less digits than its factorization.

313608209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625106.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 313608209 is about 17708.9866734379. The cubic root of 313608209 is about 679.4056289829.

The spelling of 313608209 in words is "three hundred thirteen million, six hundred eight thousand, two hundred nine".