23555491 has 4 divisors (see below), whose sum is σ = 23579584. Its totient is φ = 23531400.

The previous prime is 23555449. The next prime is 23555501. The reversal of 23555491 is 19455532.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23555491 is a prime.

It is a super-2 number, since 2×23555491² = 1109722312502162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23555891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10515 + ... + 12556.

It is an arithmetic number, because the mean of its divisors is an integer number (5894896).

Almost surely, 2^23555491 is an apocalyptic number.

23555491 is a deficient number, since it is larger than the sum of its proper divisors (24093).

23555491 is a wasteful number, since it uses less digits than its factorization.

23555491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24092.

The product of its digits is 27000, while the sum is 34.

The square root of 23555491 is about 4853.3999423085. The cubic root of 23555491 is about 286.6579915949.

The spelling of 23555491 in words is "twenty-three million, five hundred fifty-five thousand, four hundred ninety-one".