23638531 has 8 divisors (see below), whose sum is σ = 27567200. Its totient is φ = 20261304.

The previous prime is 23638529. The next prime is 23638543. The reversal of 23638531 is 13583632.

It is not a de Polignac number, because 23638531 - 2¹ = 23638529 is a prime.

It is a super-2 number, since 2×23638531² = 1117560295675922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23638493 and 23638502.

It is not an unprimeable number, because it can be changed into a prime (23638501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34116 + ... + 34801.

It is an arithmetic number, because the mean of its divisors is an integer number (3445900).

Almost surely, 2^23638531 is an apocalyptic number.

23638531 is a deficient number, since it is larger than the sum of its proper divisors (3928669).

23638531 is an frugal number, since it uses more digits than its factorization.

23638531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68938 (or 68924 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 23638531 is about 4861.9472436463. The cubic root of 23638531 is about 286.9944476419.

The spelling of 23638531 in words is "twenty-three million, six hundred thirty-eight thousand, five hundred thirty-one".