18545081 has 4 divisors (see below), whose sum is σ = 18652452. Its totient is φ = 18437712.

The previous prime is 18545077. The next prime is 18545117. The reversal of 18545081 is 18054581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18054581 = 79 ⋅228539.

It can be written as a sum of positive squares in 2 ways, for example, as 6677056 + 11868025 = 2584^2 + 3445^2 .

It is a cyclic number.

It is not a de Polignac number, because 18545081 - 2² = 18545077 is a prime.

It is a super-2 number, since 2×18545081² = 687840058593122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18545041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53426 + ... + 53771.

It is an arithmetic number, because the mean of its divisors is an integer number (4663113).

Almost surely, 2^18545081 is an apocalyptic number.

It is an amenable number.

18545081 is a deficient number, since it is larger than the sum of its proper divisors (107371).

18545081 is a wasteful number, since it uses less digits than its factorization.

18545081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107370.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 18545081 is about 4306.4000046443. The cubic root of 18545081 is about 264.6932774952.

The spelling of 18545081 in words is "eighteen million, five hundred forty-five thousand, eighty-one".