523189989 has 16 divisors (see below), whose sum is σ = 885824640. Its totient is φ = 298965600.

The previous prime is 523189981. The next prime is 523189991. The reversal of 523189989 is 989981325.

It is not a de Polignac number, because 523189989 - 2³ = 523189981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523189981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1383912 + ... + 1384289.

It is an arithmetic number, because the mean of its divisors is an integer number (55364040).

Almost surely, 2^523189989 is an apocalyptic number.

It is an amenable number.

523189989 is a deficient number, since it is larger than the sum of its proper divisors (362634651).

523189989 is a wasteful number, since it uses less digits than its factorization.

523189989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768217 (or 2768211 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 523189989 is about 22873.3466943515. The cubic root of 523189989 is about 805.7861686901.

The spelling of 523189989 in words is "five hundred twenty-three million, one hundred eighty-nine thousand, nine hundred eighty-nine".