225153521 has 4 divisors (see below), whose sum is σ = 225409392. Its totient is φ = 224897652.

The previous prime is 225153479. The next prime is 225153529. The reversal of 225153521 is 125351522.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125351522 = 2 ⋅62675761.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225153521 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 (225153529) 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, 126611 + ... + 128376.

It is an arithmetic number, because the mean of its divisors is an integer number (56352348).

Almost surely, 2^225153521 is an apocalyptic number.

It is an amenable number.

225153521 is a deficient number, since it is larger than the sum of its proper divisors (255871).

225153521 is an equidigital number, since it uses as much as digits as its factorization.

225153521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255870.

The product of its digits is 3000, while the sum is 26.

The square root of 225153521 is about 15005.1164940496. The cubic root of 225153521 is about 608.3585008082.

The spelling of 225153521 in words is "two hundred twenty-five million, one hundred fifty-three thousand, five hundred twenty-one".