316791809 has 4 divisors (see below), whose sum is σ = 318889920. Its totient is φ = 314693700.

The previous prime is 316791803. The next prime is 316791833. The reversal of 316791809 is 908197613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908197613 = 17 ⋅53423389.

It is a cyclic number.

It is not a de Polignac number, because 316791809 - 2²⁴ = 300014593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 316791809.

It is not an unprimeable number, because it can be changed into a prime (316791803) 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, 1048829 + ... + 1049130.

It is an arithmetic number, because the mean of its divisors is an integer number (79722480).

Almost surely, 2^316791809 is an apocalyptic number.

It is an amenable number.

316791809 is a deficient number, since it is larger than the sum of its proper divisors (2098111).

316791809 is a wasteful number, since it uses less digits than its factorization.

316791809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098110.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 316791809 is about 17798.6462687475. The cubic root of 316791809 is about 681.6968930536.

The spelling of 316791809 in words is "three hundred sixteen million, seven hundred ninety-one thousand, eight hundred nine".