23609881 has 9 divisors (see below), whose sum is σ = 24387519. Its totient is φ = 22856736.

The previous prime is 23609869. The next prime is 23609909. The reversal of 23609881 is 18890632.

The square root of 23609881 is 4859.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 416025 + 23193856 = 645^2 + 4816^2 .

It is not a de Polignac number, because 23609881 - 2⁵ = 23609849 is a prime.

It is a super-2 number, since 2×23609881² = 1114852961668322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23609881.

It is not an unprimeable number, because it can be changed into a prime (23609801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 208881 + ... + 208993.

Almost surely, 2^23609881 is an apocalyptic number.

23609881 is the 4859-th square number.

23609881 is the 2430-th centered octagonal number.

It is an amenable number.

23609881 is a deficient number, since it is larger than the sum of its proper divisors (777638).

23609881 is an frugal number, since it uses more digits than its factorization.

23609881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The cubic root of 23609881 is about 286.8784546047.

Multiplying 23609881 by its product of nonzero digits (20736), we get a square (489574492416 = 699696²).

The spelling of 23609881 in words is "twenty-three million, six hundred nine thousand, eight hundred eighty-one".