323128989 has 6 divisors (see below), whose sum is σ = 466741886. Its totient is φ = 215419320.

The previous prime is 323128919. The next prime is 323129003. The reversal of 323128989 is 989821323.

It can be written as a sum of positive squares in only one way, i.e., 273637764 + 49491225 = 16542^2 + 7035^2 .

It is not a de Polignac number, because 323128989 - 2¹¹ = 323126941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (323128919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17951602 + ... + 17951619.

Almost surely, 2^323128989 is an apocalyptic number.

It is an amenable number.

323128989 is a deficient number, since it is larger than the sum of its proper divisors (143612897).

323128989 is a wasteful number, since it uses less digits than its factorization.

323128989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35903227 (or 35903224 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 323128989 is about 17975.7889673861. The cubic root of 323128989 is about 686.2125248530.

The spelling of 323128989 in words is "three hundred twenty-three million, one hundred twenty-eight thousand, nine hundred eighty-nine".