1845991225 has 27 divisors (see below), whose sum is σ = 2482408359. Its totient is φ = 1361131200.

The previous prime is 1845991207. The next prime is 1845991229. The reversal of 1845991225 is 5221995481.

It is a happy number.

The square root of 1845991225 is 42965.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 1313120169 + 532871056 = 36237^2 + 23084^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1845991225 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1845991229) 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 26 ways as a sum of consecutive naturals, for example, 2792395 + ... + 2793055.

Almost surely, 2^1845991225 is an apocalyptic number.

1845991225 is the 42965-th square number.

1845991225 is the 21483-rd centered octagonal number.

It is an amenable number.

1845991225 is a deficient number, since it is larger than the sum of its proper divisors (636417134).

1845991225 is an frugal number, since it uses more digits than its factorization.

1845991225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358 (or 679 counting only the distinct ones).

The product of its digits is 259200, while the sum is 46.

The cubic root of 1845991225 is about 1226.7136865230.

The spelling of 1845991225 in words is "one billion, eight hundred forty-five million, nine hundred ninety-one thousand, two hundred twenty-five".