225909247 has 4 divisors (see below), whose sum is σ = 226343376. Its totient is φ = 225475120.

The previous prime is 225909241. The next prime is 225909263. The reversal of 225909247 is 742909522.

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

It is a cyclic number.

It is not a de Polignac number, because 225909247 - 2¹⁹ = 225384959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225909241) 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, 216283 + ... + 217324.

It is an arithmetic number, because the mean of its divisors is an integer number (56585844).

Almost surely, 2^225909247 is an apocalyptic number.

225909247 is a deficient number, since it is larger than the sum of its proper divisors (434129).

225909247 is an equidigital number, since it uses as much as digits as its factorization.

225909247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434128.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 225909247 is about 15030.2776754124. The cubic root of 225909247 is about 609.0383908470.

The spelling of 225909247 in words is "two hundred twenty-five million, nine hundred nine thousand, two hundred forty-seven".