18195145 has 4 divisors (see below), whose sum is σ = 21834180. Its totient is φ = 14556112.

The previous prime is 18195143. The next prime is 18195161. The reversal of 18195145 is 54159181.

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 11309769 + 6885376 = 3363^2 + 2624^2 .

It is a cyclic number.

It is not a de Polignac number, because 18195145 - 2¹ = 18195143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18195145.

It is not an unprimeable number, because it can be changed into a prime (18195143) 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, 1819510 + ... + 1819519.

It is an arithmetic number, because the mean of its divisors is an integer number (5458545).

Almost surely, 2^18195145 is an apocalyptic number.

It is an amenable number.

18195145 is a deficient number, since it is larger than the sum of its proper divisors (3639035).

18195145 is an equidigital number, since it uses as much as digits as its factorization.

18195145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639034.

The product of its digits is 7200, while the sum is 34.

The square root of 18195145 is about 4265.5767488113. The cubic root of 18195145 is about 263.0178198781.

The spelling of 18195145 in words is "eighteen million, one hundred ninety-five thousand, one hundred forty-five".