809317079 has 4 divisors (see below), whose sum is σ = 856923984. Its totient is φ = 761710176.

The previous prime is 809317057. The next prime is 809317087. The reversal of 809317079 is 970713908.

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

It is a cyclic number.

It is not a de Polignac number, because 809317079 - 2²⁸ = 540881623 is a prime.

It is a super-2 number, since 2×809317079² = 1309988268722184482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809317039) 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, 23803427 + ... + 23803460.

It is an arithmetic number, because the mean of its divisors is an integer number (214230996).

Almost surely, 2^809317079 is an apocalyptic number.

809317079 is a deficient number, since it is larger than the sum of its proper divisors (47606905).

809317079 is a wasteful number, since it uses less digits than its factorization.

809317079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47606904.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 809317079 is about 28448.4987125859. The cubic root of 809317079 is about 931.9077035183.

The spelling of 809317079 in words is "eight hundred nine million, three hundred seventeen thousand, seventy-nine".