872092691 has 4 divisors (see below), whose sum is σ = 872173872. Its totient is φ = 872011512.

The previous prime is 872092667. The next prime is 872092709. The reversal of 872092691 is 196290278.

It is a happy number.

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: 196290278 = 2 ⋅98145139.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872092691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872092891) 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, 21476 + ... + 46961.

It is an arithmetic number, because the mean of its divisors is an integer number (218043468).

Almost surely, 2^872092691 is an apocalyptic number.

872092691 is a deficient number, since it is larger than the sum of its proper divisors (81181).

872092691 is a wasteful number, since it uses less digits than its factorization.

872092691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81180.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 872092691 is about 29531.2155354296. The cubic root of 872092691 is about 955.4050860456.

The spelling of 872092691 in words is "eight hundred seventy-two million, ninety-two thousand, six hundred ninety-one".