225861918 has 16 divisors (see below), whose sum is σ = 467300880. Its totient is φ = 72691136.

The previous prime is 225861901. The next prime is 225861919. The reversal of 225861918 is 819168522.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 225861918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225861919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648855 + ... + 649202.

It is an arithmetic number, because the mean of its divisors is an integer number (29206305).

Almost surely, 2^225861918 is an apocalyptic number.

225861918 is an abundant number, since it is smaller than the sum of its proper divisors (241438962).

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

225861918 is a wasteful number, since it uses less digits than its factorization.

225861918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298091.

The product of its digits is 69120, while the sum is 42.

The square root of 225861918 is about 15028.7031376629. The cubic root of 225861918 is about 608.9958557854.

The spelling of 225861918 in words is "two hundred twenty-five million, eight hundred sixty-one thousand, nine hundred eighteen".