225225891 has 18 divisors (see below), whose sum is σ = 357591780. Its totient is φ = 136499880.

The previous prime is 225225853. The next prime is 225225893. The reversal of 225225891 is 198522522.

225225891 is a `hidden beast` number, since 22 + 52 + 2 + 589 + 1 = 666.

It is not a de Polignac number, because 225225891 - 2⁹ = 225225379 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (225225893) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 102321 + ... + 104498.

It is an arithmetic number, because the mean of its divisors is an integer number (19866210).

Almost surely, 2^225225891 is an apocalyptic number.

225225891 is a deficient number, since it is larger than the sum of its proper divisors (132365889).

225225891 is a wasteful number, since it uses less digits than its factorization.

225225891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206847 (or 206833 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 225225891 is about 15007.5278110687. The cubic root of 225225891 is about 608.4236743962.

The spelling of 225225891 in words is "two hundred twenty-five million, two hundred twenty-five thousand, eight hundred ninety-one".