225791 has 4 divisors (see below), whose sum is σ = 235632. Its totient is φ = 215952.

The previous prime is 225781. The next prime is 225809. The reversal of 225791 is 197522.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225721) 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, 4886 + ... + 4931.

It is an arithmetic number, because the mean of its divisors is an integer number (58908).

2²²⁵⁷⁹¹ is an apocalyptic number.

225791 is a deficient number, since it is larger than the sum of its proper divisors (9841).

225791 is an equidigital number, since it uses as much as digits as its factorization.

225791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9840.

The product of its digits is 1260, while the sum is 26.

The square root of 225791 is about 475.1747047140. The cubic root of 225791 is about 60.8932109922.

The spelling of 225791 in words is "two hundred twenty-five thousand, seven hundred ninety-one".