225491 has 4 divisors (see below), whose sum is σ = 257712. Its totient is φ = 193272.

The previous prime is 225479. The next prime is 225493. The reversal of 225491 is 194522.

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

It is a cyclic number.

It is not a de Polignac number, because 225491 - 2⁶ = 225427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225493) 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, 16100 + ... + 16113.

It is an arithmetic number, because the mean of its divisors is an integer number (64428).

2²²⁵⁴⁹¹ is an apocalyptic number.

225491 is a deficient number, since it is larger than the sum of its proper divisors (32221).

225491 is an equidigital number, since it uses as much as digits as its factorization.

225491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32220.

The product of its digits is 720, while the sum is 23.

The square root of 225491 is about 474.8589264192. The cubic root of 225491 is about 60.8662302003.

The spelling of 225491 in words is "two hundred twenty-five thousand, four hundred ninety-one".