8621989 has 2 divisors, whose sum is σ = 8621990. Its totient is φ = 8621988.

The previous prime is 8621983. The next prime is 8622001. The reversal of 8621989 is 9891268.

It is a happy number.

8621989 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., 8008900 + 613089 = 2830^2 + 783^2 .

It is a cyclic number.

It is not a de Polignac number, because 8621989 - 2⁷ = 8621861 is a prime.

It is a super-2 number, since 2×8621989² = 148677388632242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8621983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4310994 + 4310995.

It is an arithmetic number, because the mean of its divisors is an integer number (4310995).

Almost surely, 2^8621989 is an apocalyptic number.

It is an amenable number.

8621989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8621989 is an equidigital number, since it uses as much as digits as its factorization.

8621989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The square root of 8621989 is about 2936.3223596874. The cubic root of 8621989 is about 205.0544293307.

The spelling of 8621989 in words is "eight million, six hundred twenty-one thousand, nine hundred eighty-nine".