23189512509 has 24 divisors (see below), whose sum is σ = 34025732832. Its totient is φ = 15215571360.

The previous prime is 23189512481. The next prime is 23189512513. The reversal of 23189512509 is 90521598132.

23189512509 is a `hidden beast` number, since 2 + 3 + 1 + 89 + 512 + 50 + 9 = 666.

It is not a de Polignac number, because 23189512509 - 2⁵ = 23189512477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23189512579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 695862 + ... + 728424.

It is an arithmetic number, because the mean of its divisors is an integer number (1417738868).

Almost surely, 2^23189512509 is an apocalyptic number.

It is an amenable number.

23189512509 is a deficient number, since it is larger than the sum of its proper divisors (10836220323).

23189512509 is a wasteful number, since it uses less digits than its factorization.

23189512509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33817 (or 33814 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 23189512509 in words is "twenty-three billion, one hundred eighty-nine million, five hundred twelve thousand, five hundred nine".