811681379 has 16 divisors (see below), whose sum is σ = 843443712. Its totient is φ = 780668928.

The previous prime is 811681357. The next prime is 811681391. The reversal of 811681379 is 973186118.

It is a cyclic number.

It is not a de Polignac number, because 811681379 - 2¹⁶ = 811615843 is a prime.

It is a super-2 number, since 2×811681379² = 1317653322030683282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811681309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 746174 + ... + 747260.

It is an arithmetic number, because the mean of its divisors is an integer number (52715232).

Almost surely, 2^811681379 is an apocalyptic number.

811681379 is a deficient number, since it is larger than the sum of its proper divisors (31762333).

811681379 is a wasteful number, since it uses less digits than its factorization.

811681379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406.

The product of its digits is 72576, while the sum is 44.

The square root of 811681379 is about 28490.0224464636. The cubic root of 811681379 is about 932.8142980487.

The spelling of 811681379 in words is "eight hundred eleven million, six hundred eighty-one thousand, three hundred seventy-nine".