225503521 has 12 divisors (see below), whose sum is σ = 240098560. Its totient is φ = 211752000.

The previous prime is 225503513. The next prime is 225503527. The reversal of 225503521 is 125305522.

It is a happy number.

It is not a de Polignac number, because 225503521 - 2³ = 225503513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (225503527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216520 + ... + 217558.

Almost surely, 2^225503521 is an apocalyptic number.

It is an amenable number.

225503521 is a deficient number, since it is larger than the sum of its proper divisors (14595039).

225503521 is a wasteful number, since it uses less digits than its factorization.

225503521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 1807 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 225503521 is about 15016.7746536998. The cubic root of 225503521 is about 608.6735676701.

The spelling of 225503521 in words is "two hundred twenty-five million, five hundred three thousand, five hundred twenty-one".