225537521 has 16 divisors (see below), whose sum is σ = 261144000. Its totient is φ = 192506880.

The previous prime is 225537509. The next prime is 225537539. The reversal of 225537521 is 125735522.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225537521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225567521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92105 + ... + 94521.

It is an arithmetic number, because the mean of its divisors is an integer number (16321500).

Almost surely, 2^225537521 is an apocalyptic number.

It is an amenable number.

225537521 is a deficient number, since it is larger than the sum of its proper divisors (35606479).

225537521 is a wasteful number, since it uses less digits than its factorization.

225537521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2944.

The product of its digits is 21000, while the sum is 32.

The square root of 225537521 is about 15017.9066783623. The cubic root of 225537521 is about 608.7041567879.

The spelling of 225537521 in words is "two hundred twenty-five million, five hundred thirty-seven thousand, five hundred twenty-one".