811864081 has 16 divisors (see below), whose sum is σ = 935193600. Its totient is φ = 690394320.

The previous prime is 811864063. The next prime is 811864099. The reversal of 811864081 is 180468118.

It is an interprime number because it is at equal distance from previous prime (811864063) and next prime (811864099).

It is not a de Polignac number, because 811864081 - 2⁵ = 811864049 is a prime.

It is a super-2 number, since 2×811864081² = 1318246572035949122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 811864081.

It is not an unprimeable number, because it can be changed into a prime (811864021) 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, 683370 + ... + 684556.

It is an arithmetic number, because the mean of its divisors is an integer number (58449600).

Almost surely, 2^811864081 is an apocalyptic number.

It is an amenable number.

811864081 is a deficient number, since it is larger than the sum of its proper divisors (123329519).

811864081 is a wasteful number, since it uses less digits than its factorization.

811864081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 811864081 is about 28493.2286868301. The cubic root of 811864081 is about 932.8842820994.

The spelling of 811864081 in words is "eight hundred eleven million, eight hundred sixty-four thousand, eighty-one".