18102145 has 8 divisors (see below), whose sum is σ = 21767400. Its totient is φ = 14451840.

The previous prime is 18102143. The next prime is 18102151. The reversal of 18102145 is 54120181.

18102145 = 3008² + 3009².

It can be written as a sum of positive squares in 4 ways, for example, as 3055504 + 15046641 = 1748^2 + 3879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18102145 - 2¹ = 18102143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18102143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 870 + ... + 6079.

It is an arithmetic number, because the mean of its divisors is an integer number (2720925).

Almost surely, 2^18102145 is an apocalyptic number.

18102145 is the 3009-th centered square number.

It is an amenable number.

18102145 is a deficient number, since it is larger than the sum of its proper divisors (3665255).

18102145 is an equidigital number, since it uses as much as digits as its factorization.

18102145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7475.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18102145 is about 4254.6615611585. The cubic root of 18102145 is about 262.5689372986.

The spelling of 18102145 in words is "eighteen million, one hundred two thousand, one hundred forty-five".