23531555 has 4 divisors (see below), whose sum is σ = 28237872. Its totient is φ = 18825240.

The previous prime is 23531549. The next prime is 23531561. The reversal of 23531555 is 55513532.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (23531549) and next prime (23531561).

It is not a de Polignac number, because 23531555 - 2⁶ = 23531491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2353151 + ... + 2353160.

It is an arithmetic number, because the mean of its divisors is an integer number (7059468).

Almost surely, 2^23531555 is an apocalyptic number.

23531555 is a deficient number, since it is larger than the sum of its proper divisors (4706317).

23531555 is an equidigital number, since it uses as much as digits as its factorization.

23531555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4706316.

The product of its digits is 11250, while the sum is 29.

The square root of 23531555 is about 4850.9334153336. The cubic root of 23531555 is about 286.5608624925.

The spelling of 23531555 in words is "twenty-three million, five hundred thirty-one thousand, five hundred fifty-five".