225523181 has 16 divisors (see below), whose sum is σ = 246626688. Its totient is φ = 204984000.

The previous prime is 225523147. The next prime is 225523183. The reversal of 225523181 is 181325522.

It is a de Polignac number, because none of the positive numbers 2^k-225523181 is a prime.

It is a super-2 number, since 2×225523181² = 101721410336717522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225523183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256715 + ... + 257591.

It is an arithmetic number, because the mean of its divisors is an integer number (15414168).

Almost surely, 2^225523181 is an apocalyptic number.

It is an amenable number.

225523181 is a deficient number, since it is larger than the sum of its proper divisors (21103507).

225523181 is a wasteful number, since it uses less digits than its factorization.

225523181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172.

The product of its digits is 4800, while the sum is 29.

The square root of 225523181 is about 15017.4292407189. The cubic root of 225523181 is about 608.6912557526.

The spelling of 225523181 in words is "two hundred twenty-five million, five hundred twenty-three thousand, one hundred eighty-one".