225616231 has 6 divisors (see below), whose sum is σ = 239668760. Its totient is φ = 212344416.

The previous prime is 225616229. The next prime is 225616243. The reversal of 225616231 is 132616522.

It is not a de Polignac number, because 225616231 - 2¹ = 225616229 is a prime.

It is a super-2 number, since 2×225616231² = 101805367381290722, which contains 22 as substring.

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 225616231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225616271) 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, 390051 + ... + 390628.

Almost surely, 2^225616231 is an apocalyptic number.

225616231 is a deficient number, since it is larger than the sum of its proper divisors (14052529).

225616231 is an equidigital number, since it uses as much as digits as its factorization.

225616231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780713 (or 780696 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 225616231 is about 15020.5269880920. The cubic root of 225616231 is about 608.7749588014.

The spelling of 225616231 in words is "two hundred twenty-five million, six hundred sixteen thousand, two hundred thirty-one".