18251145 has 24 divisors (see below), whose sum is σ = 34512192. Its totient is φ = 8848800.

The previous prime is 18251143. The next prime is 18251147. The reversal of 18251145 is 54115281.

It is an interprime number because it is at equal distance from previous prime (18251143) and next prime (18251147).

It is not a de Polignac number, because 18251145 - 2¹ = 18251143 is a prime.

It is a super-2 number, since 2×18251145² = 666208587622050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18251143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17941 + ... + 18930.

It is an arithmetic number, because the mean of its divisors is an integer number (1438008).

Almost surely, 2^18251145 is an apocalyptic number.

18251145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18251145 is a deficient number, since it is larger than the sum of its proper divisors (16261047).

18251145 is a wasteful number, since it uses less digits than its factorization.

18251145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36893 (or 36890 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 18251145 is about 4272.1358826704. The cubic root of 18251145 is about 263.2873773709.

The spelling of 18251145 in words is "eighteen million, two hundred fifty-one thousand, one hundred forty-five".