225017145 has 12 divisors (see below), whose sum is σ = 390029796. Its totient is φ = 120009120.

The previous prime is 225017137. The next prime is 225017147. The reversal of 225017145 is 541710522.

It can be written as a sum of positive squares in 2 ways, for example, as 149744169 + 75272976 = 12237^2 + 8676^2 .

It is not a de Polignac number, because 225017145 - 2³ = 225017137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (225017147) 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 11 ways as a sum of consecutive naturals, for example, 2500146 + ... + 2500235.

It is an arithmetic number, because the mean of its divisors is an integer number (32502483).

Almost surely, 2^225017145 is an apocalyptic number.

It is an amenable number.

225017145 is a deficient number, since it is larger than the sum of its proper divisors (165012651).

225017145 is a wasteful number, since it uses less digits than its factorization.

225017145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000392 (or 5000389 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 225017145 is about 15000.5714891133. The cubic root of 225017145 is about 608.2356479580.

Adding to 225017145 its reverse (541710522), we get a palindrome (766727667).

It can be divided in two parts, 22501 and 7145, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 225017145 in words is "two hundred twenty-five million, seventeen thousand, one hundred forty-five".