8516639 has 2 divisors, whose sum is σ = 8516640. Its totient is φ = 8516638.

The previous prime is 8516621. The next prime is 8516653. The reversal of 8516639 is 9366158.

8516639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8516639 - 2²⁰ = 7468063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8516659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4258319 + 4258320.

It is an arithmetic number, because the mean of its divisors is an integer number (4258320).

Almost surely, 2^8516639 is an apocalyptic number.

8516639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8516639 is an equidigital number, since it uses as much as digits as its factorization.

8516639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 8516639 is about 2918.3281172617. The cubic root of 8516639 is about 204.2158342966.

The spelling of 8516639 in words is "eight million, five hundred sixteen thousand, six hundred thirty-nine".