316399309 has 4 divisors (see below), whose sum is σ = 327309660. Its totient is φ = 305488960.

The previous prime is 316399283. The next prime is 316399319. The reversal of 316399309 is 903993613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903993613 = 10861 ⋅83233.

It can be written as a sum of positive squares in 2 ways, for example, as 51523684 + 264875625 = 7178^2 + 16275^2 .

It is a cyclic number.

It is not a de Polignac number, because 316399309 - 2⁵ = 316399277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316399319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5455132 + ... + 5455189.

It is an arithmetic number, because the mean of its divisors is an integer number (81827415).

Almost surely, 2^316399309 is an apocalyptic number.

It is an amenable number.

316399309 is a deficient number, since it is larger than the sum of its proper divisors (10910351).

316399309 is a wasteful number, since it uses less digits than its factorization.

316399309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910350.

The product of its (nonzero) digits is 118098, while the sum is 43.

The square root of 316399309 is about 17787.6167318728. The cubic root of 316399309 is about 681.4152395066.

The spelling of 316399309 in words is "three hundred sixteen million, three hundred ninety-nine thousand, three hundred nine".