18251361 has 12 divisors (see below), whose sum is σ = 26402688. Its totient is φ = 12149304.

The previous prime is 18251347. The next prime is 18251371. The reversal of 18251361 is 16315281.

It is not a de Polignac number, because 18251361 - 2⁵ = 18251329 is a prime.

It is a super-2 number, since 2×18251361² = 666224356704642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18251371) 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 11 ways as a sum of consecutive naturals, for example, 7816 + ... + 9878.

It is an arithmetic number, because the mean of its divisors is an integer number (2200224).

Almost surely, 2^18251361 is an apocalyptic number.

It is an amenable number.

18251361 is a deficient number, since it is larger than the sum of its proper divisors (8151327).

18251361 is a wasteful number, since it uses less digits than its factorization.

18251361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052 (or 3049 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 18251361 is about 4272.1611626904. The cubic root of 18251361 is about 263.2884160245.

The spelling of 18251361 in words is "eighteen million, two hundred fifty-one thousand, three hundred sixty-one".