18225261 has 6 divisors (see below), whose sum is σ = 26325390. Its totient is φ = 12150168.

The previous prime is 18225257. The next prime is 18225271. The reversal of 18225261 is 16252281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 900 = 4269^2 + 30^2 .

It is not a de Polignac number, because 18225261 - 2² = 18225257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1012506 + ... + 1012523.

It is an arithmetic number, because the mean of its divisors is an integer number (4387565).

Almost surely, 2^18225261 is an apocalyptic number.

It is an amenable number.

18225261 is a deficient number, since it is larger than the sum of its proper divisors (8100129).

18225261 is a wasteful number, since it uses less digits than its factorization.

18225261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025035 (or 2025032 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 18225261 is about 4269.1054098019. The cubic root of 18225261 is about 263.1628526778.

The spelling of 18225261 in words is "eighteen million, two hundred twenty-five thousand, two hundred sixty-one".