811679491 has 8 divisors (see below), whose sum is σ = 929542400. Its totient is φ = 694293768.

The previous prime is 811679447. The next prime is 811679513. The reversal of 811679491 is 194976118.

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

It is not a de Polignac number, because 811679491 - 2⁹ = 811678979 is a prime.

It is a super-2 number, since 2×811679491² = 1317647192220038162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811671491) 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, 115641 + ... + 122458.

It is an arithmetic number, because the mean of its divisors is an integer number (116192800).

Almost surely, 2^811679491 is an apocalyptic number.

811679491 is a deficient number, since it is larger than the sum of its proper divisors (117862909).

811679491 is a wasteful number, since it uses less digits than its factorization.

811679491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238593.

The product of its digits is 108864, while the sum is 46.

The square root of 811679491 is about 28489.9893120373. The cubic root of 811679491 is about 932.8135747949.

The spelling of 811679491 in words is "eight hundred eleven million, six hundred seventy-nine thousand, four hundred ninety-one".