518444225 has 12 divisors (see below), whose sum is σ = 692322876. Its totient is φ = 382850880.

The previous prime is 518444207. The next prime is 518444237. The reversal of 518444225 is 522444815.

It can be written as a sum of positive squares in 6 ways, for example, as 86136961 + 432307264 = 9281^2 + 20792^2 .

It is not a de Polignac number, because 518444225 - 2¹⁶ = 518378689 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 797282 + ... + 797931.

It is an arithmetic number, because the mean of its divisors is an integer number (57693573).

Almost surely, 2^518444225 is an apocalyptic number.

It is an amenable number.

518444225 is a deficient number, since it is larger than the sum of its proper divisors (173878651).

518444225 is a wasteful number, since it uses less digits than its factorization.

518444225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595236 (or 1595231 counting only the distinct ones).

The product of its digits is 51200, while the sum is 35.

The square root of 518444225 is about 22769.3703250661. The cubic root of 518444225 is about 803.3423833319.

The spelling of 518444225 in words is "five hundred eighteen million, four hundred forty-four thousand, two hundred twenty-five".