923121989 has 4 divisors (see below), whose sum is σ = 923993100. Its totient is φ = 922250880.

The previous prime is 923121959. The next prime is 923122021. The reversal of 923121989 is 989121329.

It is a happy number.

923121989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 268632100 + 654489889 = 16390^2 + 25583^2 .

It is a cyclic number.

It is not a de Polignac number, because 923121989 - 2⁸ = 923121733 is a prime.

It is a super-2 number, since 2×923121989² = 1704308413150632242, 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 (923121919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433964 + ... + 436085.

It is an arithmetic number, because the mean of its divisors is an integer number (230998275).

Almost surely, 2^923121989 is an apocalyptic number.

It is an amenable number.

923121989 is a deficient number, since it is larger than the sum of its proper divisors (871111).

923121989 is a wasteful number, since it uses less digits than its factorization.

923121989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871110.

The product of its digits is 69984, while the sum is 44.

The square root of 923121989 is about 30382.9226540173. The cubic root of 923121989 is about 973.6877332566.

The spelling of 923121989 in words is "nine hundred twenty-three million, one hundred twenty-one thousand, nine hundred eighty-nine".