811981869 has 8 divisors (see below), whose sum is σ = 1086059040. Its totient is φ = 539612976.

The previous prime is 811981861. The next prime is 811981879. The reversal of 811981869 is 968189118.

811981869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 811981869 - 2³ = 811981861 is a prime.

It is a super-2 number, since 2×811981869² = 1318629111169466322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811981861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425959 + ... + 427860.

It is an arithmetic number, because the mean of its divisors is an integer number (135757380).

Almost surely, 2^811981869 is an apocalyptic number.

It is an amenable number.

811981869 is a deficient number, since it is larger than the sum of its proper divisors (274077171).

811981869 is a wasteful number, since it uses less digits than its factorization.

811981869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854139.

The product of its digits is 248832, while the sum is 51.

The square root of 811981869 is about 28495.2955590919. The cubic root of 811981869 is about 932.9293952584.

The spelling of 811981869 in words is "eight hundred eleven million, nine hundred eighty-one thousand, eight hundred sixty-nine".