18194545 has 4 divisors (see below), whose sum is σ = 21833460. Its totient is φ = 14555632.

The previous prime is 18194521. The next prime is 18194557. The reversal of 18194545 is 54549181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54549181 = 31 ⋅1759651.

It can be written as a sum of positive squares in 2 ways, for example, as 9480241 + 8714304 = 3079^2 + 2952^2 .

It is a cyclic number.

It is not a de Polignac number, because 18194545 - 2¹¹ = 18192497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819450 + ... + 1819459.

It is an arithmetic number, because the mean of its divisors is an integer number (5458365).

Almost surely, 2^18194545 is an apocalyptic number.

It is an amenable number.

18194545 is a deficient number, since it is larger than the sum of its proper divisors (3638915).

18194545 is an equidigital number, since it uses as much as digits as its factorization.

18194545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3638914.

The product of its digits is 28800, while the sum is 37.

The square root of 18194545 is about 4265.5064177657. The cubic root of 18194545 is about 263.0149287694.

The spelling of 18194545 in words is "eighteen million, one hundred ninety-four thousand, five hundred forty-five".