225997 has 4 divisors (see below), whose sum is σ = 233820. Its totient is φ = 218176.

The previous prime is 225989. The next prime is 226001. The reversal of 225997 is 799522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799522 = 2 ⋅399761.

It can be written as a sum of positive squares in 2 ways, for example, as 181476 + 44521 = 426^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 225997 - 2³ = 225989 is a prime.

It is a Duffinian number.

225997 is a lucky number.

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 (225977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3868 + ... + 3925.

It is an arithmetic number, because the mean of its divisors is an integer number (58455).

2²²⁵⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

225997 is a deficient number, since it is larger than the sum of its proper divisors (7823).

225997 is an equidigital number, since it uses as much as digits as its factorization.

225997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7822.

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

The square root of 225997 is about 475.3914176760. The cubic root of 225997 is about 60.9117239659.

The spelling of 225997 in words is "two hundred twenty-five thousand, nine hundred ninety-seven".