23505531 has 16 divisors (see below), whose sum is σ = 35887104. Its totient is φ = 13405824.

The previous prime is 23505497. The next prime is 23505539. The reversal of 23505531 is 13550532.

It is not a de Polignac number, because 23505531 - 2⁶ = 23505467 is a prime.

It is a super-2 number, since 2×23505531² = 1105019975183922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23505539) 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, 17475 + ... + 18771.

It is an arithmetic number, because the mean of its divisors is an integer number (2242944).

Almost surely, 2^23505531 is an apocalyptic number.

23505531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23505531 is a deficient number, since it is larger than the sum of its proper divisors (12381573).

23505531 is a wasteful number, since it uses less digits than its factorization.

23505531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170.

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 23505531 is about 4848.2503029444. The cubic root of 23505531 is about 286.4551858002.

The spelling of 23505531 in words is "twenty-three million, five hundred five thousand, five hundred thirty-one".