8616989 has 2 divisors, whose sum is σ = 8616990. Its totient is φ = 8616988.

The previous prime is 8616947. The next prime is 8616991. The reversal of 8616989 is 9896168.

8616989 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 can be written as a sum of positive squares in only one way, i.e., 8323225 + 293764 = 2885^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 8616989 - 2⁸ = 8616733 is a prime.

It is a super-2 number, since 2×8616989² = 148504998852242, which contains 22 as substring.

Together with 8616991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8616919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4308494 + 4308495.

It is an arithmetic number, because the mean of its divisors is an integer number (4308495).

Almost surely, 2^8616989 is an apocalyptic number.

It is an amenable number.

8616989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8616989 is an equidigital number, since it uses as much as digits as its factorization.

8616989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The square root of 8616989 is about 2935.4708310593. The cubic root of 8616989 is about 205.0147837841.

The spelling of 8616989 in words is "eight million, six hundred sixteen thousand, nine hundred eighty-nine".