225521830 has 32 divisors (see below), whose sum is σ = 452446560. Its totient is φ = 80432640.

The previous prime is 225521827. The next prime is 225521833. The reversal of 225521830 is 38125522.

It is an interprime number because it is at equal distance from previous prime (225521827) and next prime (225521833).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225521833) 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 15 ways as a sum of consecutive naturals, for example, 31681 + ... + 38140.

It is an arithmetic number, because the mean of its divisors is an integer number (14138955).

Almost surely, 2^225521830 is an apocalyptic number.

225521830 is an abundant number, since it is smaller than the sum of its proper divisors (226924730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225521830 is a wasteful number, since it uses less digits than its factorization.

225521830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69864.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 225521830 is about 15017.3842595840. The cubic root of 225521830 is about 608.6900402921.

The spelling of 225521830 in words is "two hundred twenty-five million, five hundred twenty-one thousand, eight hundred thirty".