225021173 has 4 divisors (see below), whose sum is σ = 242330508. Its totient is φ = 207711840.

The previous prime is 225021149. The next prime is 225021187. The reversal of 225021173 is 371120522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 152720164 + 72301009 = 12358^2 + 8503^2 .

It is a cyclic number.

It is not a de Polignac number, because 225021173 - 2⁶ = 225021109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225021143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8654648 + ... + 8654673.

It is an arithmetic number, because the mean of its divisors is an integer number (60582627).

Almost surely, 2^225021173 is an apocalyptic number.

It is an amenable number.

225021173 is a deficient number, since it is larger than the sum of its proper divisors (17309335).

225021173 is a wasteful number, since it uses less digits than its factorization.

225021173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17309334.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 225021173 is about 15000.7057500639. The cubic root of 225021173 is about 608.2392772497.

Adding to 225021173 its reverse (371120522), we get a palindrome (596141695).

The spelling of 225021173 in words is "two hundred twenty-five million, twenty-one thousand, one hundred seventy-three".