225999 has 6 divisors (see below), whose sum is σ = 326456. Its totient is φ = 150660.

The previous prime is 225989. The next prime is 226001. The reversal of 225999 is 999522.

It is not a de Polignac number, because 225999 - 2⁴ = 225983 is a prime.

It is a Duffinian number.

225999 is a modest number, since divided by 999 gives 225 as remainder.

It is a plaindrome in base 10.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12547 + ... + 12564.

2²²⁵⁹⁹⁹ is an apocalyptic number.

225999 is a deficient number, since it is larger than the sum of its proper divisors (100457).

225999 is a wasteful number, since it uses less digits than its factorization.

225999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25117 (or 25114 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 225999 is about 475.3935212011. The cubic root of 225999 is about 60.9119036484.

The spelling of 225999 in words is "two hundred twenty-five thousand, nine hundred ninety-nine".