813079 has 4 divisors (see below), whose sum is σ = 826920. Its totient is φ = 799240.

The previous prime is 813061. The next prime is 813083. The reversal of 813079 is 970318.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813079 is a prime.

It is a super-2 number, since 2×813079² = 1322194920482, 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 (813049) 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, 6832 + ... + 6949.

It is an arithmetic number, because the mean of its divisors is an integer number (206730).

2⁸¹³⁰⁷⁹ is an apocalyptic number.

813079 is a deficient number, since it is larger than the sum of its proper divisors (13841).

813079 is a wasteful number, since it uses less digits than its factorization.

813079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13840.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 813079 is about 901.7089330821. The cubic root of 813079 is about 93.3349390313.

It can be divided in two parts, 81 and 3079, that added together give a triangular number (3160 = T₇₉).

The spelling of 813079 in words is "eight hundred thirteen thousand, seventy-nine".