225521555 has 32 divisors (see below), whose sum is σ = 323979264. Its totient is φ = 147350016.

The previous prime is 225521533. The next prime is 225521567. The reversal of 225521555 is 555125522.

It is a cyclic number.

It is not a de Polignac number, because 225521555 - 2⁸ = 225521299 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, 348242 + ... + 348888.

It is an arithmetic number, because the mean of its divisors is an integer number (10124352).

Almost surely, 2^225521555 is an apocalyptic number.

225521555 is a deficient number, since it is larger than the sum of its proper divisors (98457709).

225521555 is a wasteful number, since it uses less digits than its factorization.

225521555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115.

The product of its digits is 25000, while the sum is 32.

The square root of 225521555 is about 15017.3751035259. The cubic root of 225521555 is about 608.6897928810.

The spelling of 225521555 in words is "two hundred twenty-five million, five hundred twenty-one thousand, five hundred fifty-five".