811617879 has 8 divisors (see below), whose sum is σ = 1083942400. Its totient is φ = 540185976.

The previous prime is 811617857. The next prime is 811617881. The reversal of 811617879 is 978716118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 811617879 - 2⁵ = 811617847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811617839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221029 + ... + 224670.

It is an arithmetic number, because the mean of its divisors is an integer number (135492800).

Almost surely, 2^811617879 is an apocalyptic number.

811617879 is a deficient number, since it is larger than the sum of its proper divisors (272324521).

811617879 is a wasteful number, since it uses less digits than its factorization.

811617879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446309.

The product of its digits is 169344, while the sum is 48.

The square root of 811617879 is about 28488.9079994302. The cubic root of 811617879 is about 932.7899718971.

The spelling of 811617879 in words is "eight hundred eleven million, six hundred seventeen thousand, eight hundred seventy-nine".