872499091 has 4 divisors (see below), whose sum is σ = 888961392. Its totient is φ = 856036792.

The previous prime is 872499011. The next prime is 872499101. The reversal of 872499091 is 190994278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872499091 is a prime.

It is a super-2 number, since 2×872499091² = 1522509327591652562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872499011) 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, 8231071 + ... + 8231176.

It is an arithmetic number, because the mean of its divisors is an integer number (222240348).

Almost surely, 2^872499091 is an apocalyptic number.

872499091 is a deficient number, since it is larger than the sum of its proper divisors (16462301).

872499091 is a wasteful number, since it uses less digits than its factorization.

872499091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16462300.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 872499091 is about 29538.0955885785. The cubic root of 872499091 is about 955.5534710103.

The spelling of 872499091 in words is "eight hundred seventy-two million, four hundred ninety-nine thousand, ninety-one".