8516991 has 16 divisors (see below), whose sum is σ = 13022208. Its totient is φ = 4850400.

The previous prime is 8516987. The next prime is 8517023. The reversal of 8516991 is 1996158.

It is not a de Polignac number, because 8516991 - 2² = 8516987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8516951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8581 + ... + 9521.

It is an arithmetic number, because the mean of its divisors is an integer number (813888).

Almost surely, 2^8516991 is an apocalyptic number.

8516991 is a deficient number, since it is larger than the sum of its proper divisors (4505217).

8516991 is a wasteful number, since it uses less digits than its factorization.

8516991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382.

The product of its digits is 19440, while the sum is 39.

The square root of 8516991 is about 2918.3884251415. The cubic root of 8516991 is about 204.2186477298.

The spelling of 8516991 in words is "eight million, five hundred sixteen thousand, nine hundred ninety-one".