18251825 has 18 divisors (see below), whose sum is σ = 23114034. Its totient is φ = 14296320.

The previous prime is 18251819. The next prime is 18251843. The reversal of 18251825 is 52815281.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 3073009 + 15178816 = 1753^2 + 3896^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18251825 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18251791 and 18251800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 133157 + ... + 133293.

It is an arithmetic number, because the mean of its divisors is an integer number (1284113).

Almost surely, 2^18251825 is an apocalyptic number.

It is an amenable number.

18251825 is a deficient number, since it is larger than the sum of its proper divisors (4862209).

18251825 is an equidigital number, since it uses as much as digits as its factorization.

18251825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 215 counting only the distinct ones).

The product of its digits is 6400, while the sum is 32.

The square root of 18251825 is about 4272.2154674127. The cubic root of 18251825 is about 263.2906471784.

The spelling of 18251825 in words is "eighteen million, two hundred fifty-one thousand, eight hundred twenty-five".