23689521 has 6 divisors (see below), whose sum is σ = 34218210. Its totient is φ = 15793008.

The previous prime is 23689511. The next prime is 23689529. The reversal of 23689521 is 12598632.

It can be written as a sum of positive squares in only one way, i.e., 16719921 + 6969600 = 4089^2 + 2640^2 .

It is not a de Polignac number, because 23689521 - 2¹¹ = 23687473 is a prime.

It is a super-2 number, since 2×23689521² = 1122386810418882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23689529) 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 5 ways as a sum of consecutive naturals, for example, 1316076 + ... + 1316093.

It is an arithmetic number, because the mean of its divisors is an integer number (5703035).

Almost surely, 2^23689521 is an apocalyptic number.

It is an amenable number.

23689521 is a deficient number, since it is larger than the sum of its proper divisors (10528689).

23689521 is a wasteful number, since it uses less digits than its factorization.

23689521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632175 (or 2632172 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 23689521 is about 4867.1882026484. The cubic root of 23689521 is about 287.2006552865.

The spelling of 23689521 in words is "twenty-three million, six hundred eighty-nine thousand, five hundred twenty-one".