811943139 has 8 divisors (see below), whose sum is σ = 1237246720. Its totient is φ = 463967496.

The previous prime is 811943113. The next prime is 811943159. The reversal of 811943139 is 931349118.

It is a happy number.

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

It is not a de Polignac number, because 811943139 - 2⁸ = 811942883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 811943097 and 811943106.

It is not an unprimeable number, because it can be changed into a prime (811943159) 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, 19331959 + ... + 19332000.

It is an arithmetic number, because the mean of its divisors is an integer number (154655840).

Almost surely, 2^811943139 is an apocalyptic number.

811943139 is a deficient number, since it is larger than the sum of its proper divisors (425303581).

811943139 is a wasteful number, since it uses less digits than its factorization.

811943139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38663969.

The product of its digits is 23328, while the sum is 39.

The square root of 811943139 is about 28494.6159651258. The cubic root of 811943139 is about 932.9145620331.

The spelling of 811943139 in words is "eight hundred eleven million, nine hundred forty-three thousand, one hundred thirty-nine".