8636989 has 2 divisors, whose sum is σ = 8636990. Its totient is φ = 8636988.

The previous prime is 8636987. The next prime is 8637007. The reversal of 8636989 is 9896368.

8636989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4656964 + 3980025 = 2158^2 + 1995^2 .

It is a cyclic number.

It is not a de Polignac number, because 8636989 - 2¹ = 8636987 is a prime.

It is a super-2 number, since 2×8636989² = 149195157972242, which contains 22 as substring.

Together with 8636987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8636987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4318494 + 4318495.

It is an arithmetic number, because the mean of its divisors is an integer number (4318495).

Almost surely, 2^8636989 is an apocalyptic number.

It is an amenable number.

8636989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8636989 is an equidigital number, since it uses as much as digits as its factorization.

8636989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The square root of 8636989 is about 2938.8754652077. The cubic root of 8636989 is about 205.1732740836.

The spelling of 8636989 in words is "eight million, six hundred thirty-six thousand, nine hundred eighty-nine".