225021145 has 4 divisors (see below), whose sum is σ = 270025380. Its totient is φ = 180016912.

The previous prime is 225021143. The next prime is 225021149. The reversal of 225021145 is 541120522.

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 132342016 + 92679129 = 11504^2 + 9627^2 .

It is a cyclic number.

It is not a de Polignac number, because 225021145 - 2¹ = 225021143 is a prime.

It is a super-2 number, since 2×225021145² = 101269031394222050, which contains 22 as substring.

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, 22502110 + ... + 22502119.

It is an arithmetic number, because the mean of its divisors is an integer number (67506345).

Almost surely, 2^225021145 is an apocalyptic number.

It is an amenable number.

225021145 is a deficient number, since it is larger than the sum of its proper divisors (45004235).

225021145 is an equidigital number, since it uses as much as digits as its factorization.

225021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45004234.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 225021145 is about 15000.7048167744. The cubic root of 225021145 is about 608.2392520214.

Adding to 225021145 its reverse (541120522), we get a palindrome (766141667).

The spelling of 225021145 in words is "two hundred twenty-five million, twenty-one thousand, one hundred forty-five".