225555123 has 4 divisors (see below), whose sum is σ = 300740168. Its totient is φ = 150370080.

The previous prime is 225555107. The next prime is 225555131. The reversal of 225555123 is 321555522.

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

It is not a de Polignac number, because 225555123 - 2⁴ = 225555107 is a prime.

It is a super-2 number, since 2×225555123² = 101750227023090258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225555173) 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, 37592518 + ... + 37592523.

It is an arithmetic number, because the mean of its divisors is an integer number (75185042).

Almost surely, 2^225555123 is an apocalyptic number.

225555123 is a deficient number, since it is larger than the sum of its proper divisors (75185045).

225555123 is an equidigital number, since it uses as much as digits as its factorization.

225555123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75185044.

The product of its digits is 15000, while the sum is 30.

The square root of 225555123 is about 15018.4927006674. The cubic root of 225555123 is about 608.7199917464.

The spelling of 225555123 in words is "two hundred twenty-five million, five hundred fifty-five thousand, one hundred twenty-three".