872256991 has 6 divisors (see below), whose sum is σ = 911830640. Its totient is φ = 834332268.

The previous prime is 872256967. The next prime is 872257027. The reversal of 872256991 is 199652278.

It is not a de Polignac number, because 872256991 - 2⁷ = 872256863 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 (872256911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 823911 + ... + 824968.

Almost surely, 2^872256991 is an apocalyptic number.

872256991 is a deficient number, since it is larger than the sum of its proper divisors (39573649).

872256991 is a wasteful number, since it uses less digits than its factorization.

872256991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648925 (or 1648902 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The square root of 872256991 is about 29533.9972066092. The cubic root of 872256991 is about 955.4650808911.

The spelling of 872256991 in words is "eight hundred seventy-two million, two hundred fifty-six thousand, nine hundred ninety-one".