225381209 has 4 divisors (see below), whose sum is σ = 235180416. Its totient is φ = 215582004.

The previous prime is 225381203. The next prime is 225381229. The reversal of 225381209 is 902183522.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225381209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225381203) 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, 4899569 + ... + 4899614.

It is an arithmetic number, because the mean of its divisors is an integer number (58795104).

Almost surely, 2^225381209 is an apocalyptic number.

It is an amenable number.

225381209 is a deficient number, since it is larger than the sum of its proper divisors (9799207).

225381209 is an equidigital number, since it uses as much as digits as its factorization.

225381209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9799206.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 225381209 is about 15012.7015889879. The cubic root of 225381209 is about 608.5635005853.

The spelling of 225381209 in words is "two hundred twenty-five million, three hundred eighty-one thousand, two hundred nine".