18102149 has 4 divisors (see below), whose sum is σ = 19494636. Its totient is φ = 16709664.

The previous prime is 18102143. The next prime is 18102151. The reversal of 18102149 is 94120181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9042049 + 9060100 = 3007^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 18102149 - 2⁸ = 18101893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18102143) 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 3 ways as a sum of consecutive naturals, for example, 696224 + ... + 696249.

It is an arithmetic number, because the mean of its divisors is an integer number (4873659).

Almost surely, 2^18102149 is an apocalyptic number.

It is an amenable number.

18102149 is a deficient number, since it is larger than the sum of its proper divisors (1392487).

18102149 is a wasteful number, since it uses less digits than its factorization.

18102149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392486.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 18102149 is about 4254.6620312312. The cubic root of 18102149 is about 262.5689566384.

The spelling of 18102149 in words is "eighteen million, one hundred two thousand, one hundred forty-nine".