8523991 has 12 divisors (see below), whose sum is σ = 10055712. Its totient is φ = 7203168.

The previous prime is 8523979. The next prime is 8524013. The reversal of 8523991 is 1993258.

It is not a de Polignac number, because 8523991 - 2⁵ = 8523959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8523991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8523091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2386 + ... + 4768.

It is an arithmetic number, because the mean of its divisors is an integer number (837976).

Almost surely, 2^8523991 is an apocalyptic number.

8523991 is a deficient number, since it is larger than the sum of its proper divisors (1531721).

8523991 is a wasteful number, since it uses less digits than its factorization.

8523991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470 (or 2463 counting only the distinct ones).

The product of its digits is 19440, while the sum is 37.

The square root of 8523991 is about 2919.5874708595. The cubic root of 8523991 is about 204.2745805929.

The spelling of 8523991 in words is "eight million, five hundred twenty-three thousand, nine hundred ninety-one".