225021245 has 4 divisors (see below), whose sum is σ = 270025500. Its totient is φ = 180016992.

The previous prime is 225021239. The next prime is 225021271. The reversal of 225021245 is 542120522.

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 23551609 + 201469636 = 4853^2 + 14194^2 .

It is a cyclic number.

It is not a de Polignac number, because 225021245 - 2⁴ = 225021229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 225021245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22502120 + ... + 22502129.

It is an arithmetic number, because the mean of its divisors is an integer number (67506375).

Almost surely, 2^225021245 is an apocalyptic number.

It is an amenable number.

225021245 is a deficient number, since it is larger than the sum of its proper divisors (45004255).

225021245 is an equidigital number, since it uses as much as digits as its factorization.

225021245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45004254.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 225021245 is about 15000.7081499508. The cubic root of 225021245 is about 608.2393421225.

Adding to 225021245 its reverse (542120522), we get a palindrome (767141767).

The spelling of 225021245 in words is "two hundred twenty-five million, twenty-one thousand, two hundred forty-five".