23155555 has 4 divisors (see below), whose sum is σ = 27786672. Its totient is φ = 18524440.

The previous prime is 23155523. The next prime is 23155567. The reversal of 23155555 is 55555132.

It is a happy number.

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

It is not a de Polignac number, because 23155555 - 2⁵ = 23155523 is a prime.

It is a Duffinian number.

23155555 is a modest number, since divided by 5555 gives 2315 as remainder.

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, 2315551 + ... + 2315560.

It is an arithmetic number, because the mean of its divisors is an integer number (6946668).

Almost surely, 2^23155555 is an apocalyptic number.

23155555 is a deficient number, since it is larger than the sum of its proper divisors (4631117).

23155555 is an equidigital number, since it uses as much as digits as its factorization.

23155555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631116.

The product of its digits is 18750, while the sum is 31.

The square root of 23155555 is about 4812.0219243058. The cubic root of 23155555 is about 285.0263851636.

The spelling of 23155555 in words is "twenty-three million, one hundred fifty-five thousand, five hundred fifty-five".