225521545 has 32 divisors (see below), whose sum is σ = 297792000. Its totient is φ = 163296000.

The previous prime is 225521533. The next prime is 225521567. The reversal of 225521545 is 545125522.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-225521545 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299920 + ... + 300670.

It is an arithmetic number, because the mean of its divisors is an integer number (9306000).

Almost surely, 2^225521545 is an apocalyptic number.

It is an amenable number.

225521545 is a deficient number, since it is larger than the sum of its proper divisors (72270455).

225521545 is a wasteful number, since it uses less digits than its factorization.

225521545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913.

The product of its digits is 20000, while the sum is 31.

The square root of 225521545 is about 15017.3747705782. The cubic root of 225521545 is about 608.6897838842.

The spelling of 225521545 in words is "two hundred twenty-five million, five hundred twenty-one thousand, five hundred forty-five".