811872079 has 4 divisors (see below), whose sum is σ = 811959984. Its totient is φ = 811784176.

The previous prime is 811872067. The next prime is 811872133. The reversal of 811872079 is 970278118.

It is a happy number.

811872079 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 970278118 = 2 ⋅485139059.

It is a cyclic number.

It is not a de Polignac number, because 811872079 - 2¹³ = 811863887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811872779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28222 + ... + 49195.

It is an arithmetic number, because the mean of its divisors is an integer number (202989996).

Almost surely, 2^811872079 is an apocalyptic number.

811872079 is a deficient number, since it is larger than the sum of its proper divisors (87905).

811872079 is a wasteful number, since it uses less digits than its factorization.

811872079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87904.

The product of its (nonzero) digits is 56448, while the sum is 43.

The square root of 811872079 is about 28493.3690356195. The cubic root of 811872079 is about 932.8873454955.

The spelling of 811872079 in words is "eight hundred eleven million, eight hundred seventy-two thousand, seventy-nine".