225979 has 4 divisors (see below), whose sum is σ = 243376. Its totient is φ = 208584.

The previous prime is 225977. The next prime is 225983. The reversal of 225979 is 979522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979522 = 2 ⋅489761.

It is a cyclic number.

It is not a de Polignac number, because 225979 - 2¹ = 225977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225977) 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, 8679 + ... + 8704.

It is an arithmetic number, because the mean of its divisors is an integer number (60844).

2²²⁵⁹⁷⁹ is an apocalyptic number.

225979 is a deficient number, since it is larger than the sum of its proper divisors (17397).

225979 is a wasteful number, since it uses less digits than its factorization.

225979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17396.

The product of its digits is 11340, while the sum is 34.

The square root of 225979 is about 475.3724855311. The cubic root of 225979 is about 60.9101067761.

The spelling of 225979 in words is "two hundred twenty-five thousand, nine hundred seventy-nine".