225239509 has 16 divisors (see below), whose sum is σ = 261576000. Its totient is φ = 191790720.

The previous prime is 225239467. The next prime is 225239519. The reversal of 225239509 is 905932522.

It is not a de Polignac number, because 225239509 - 2⁷ = 225239381 is a prime.

It is a super-2 number, since 2×225239509² = 101465672829122162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225239519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12547 + ... + 24655.

It is an arithmetic number, because the mean of its divisors is an integer number (16348500).

Almost surely, 2^225239509 is an apocalyptic number.

It is an amenable number.

225239509 is a deficient number, since it is larger than the sum of its proper divisors (36336491).

225239509 is a wasteful number, since it uses less digits than its factorization.

225239509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12228.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 225239509 is about 15007.9815098500. The cubic root of 225239509 is about 608.4359366729.

The spelling of 225239509 in words is "two hundred twenty-five million, two hundred thirty-nine thousand, five hundred nine".