8631989 has 4 divisors (see below), whose sum is σ = 8865324. Its totient is φ = 8398656.

The previous prime is 8631979. The next prime is 8632003. The reversal of 8631989 is 9891368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8076964 + 555025 = 2842^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 8631989 - 2¹² = 8627893 is a prime.

It is a super-2 number, since 2×8631989² = 149022468192242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8631979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116612 + ... + 116685.

It is an arithmetic number, because the mean of its divisors is an integer number (2216331).

Almost surely, 2^8631989 is an apocalyptic number.

It is an amenable number.

8631989 is a deficient number, since it is larger than the sum of its proper divisors (233335).

8631989 is a wasteful number, since it uses less digits than its factorization.

8631989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233334.

The product of its digits is 93312, while the sum is 44.

The square root of 8631989 is about 2938.0246765472. The cubic root of 8631989 is about 205.1336744657.

The spelling of 8631989 in words is "eight million, six hundred thirty-one thousand, nine hundred eighty-nine".