225225729 has 24 divisors (see below), whose sum is σ = 343586880. Its totient is φ = 141880992.

The previous prime is 225225709. The next prime is 225225733. The reversal of 225225729 is 927522522.

It is not a de Polignac number, because 225225729 - 2¹¹ = 225223681 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 225225693 and 225225702.

It is not an unprimeable number, because it can be changed into a prime (225225709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10627 + ... + 23735.

It is an arithmetic number, because the mean of its divisors is an integer number (14316120).

Almost surely, 2^225225729 is an apocalyptic number.

It is an amenable number.

225225729 is a deficient number, since it is larger than the sum of its proper divisors (118361151).

225225729 is a wasteful number, since it uses less digits than its factorization.

225225729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13221 (or 13218 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 225225729 is about 15007.5224137764. The cubic root of 225225729 is about 608.4235285209.

The spelling of 225225729 in words is "two hundred twenty-five million, two hundred twenty-five thousand, seven hundred twenty-nine".