18691045 has 4 divisors (see below), whose sum is σ = 22429260. Its totient is φ = 14952832.

The previous prime is 18691021. The next prime is 18691063. The reversal of 18691045 is 54019681.

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 13771521 + 4919524 = 3711^2 + 2218^2 .

It is a cyclic number.

It is not a de Polignac number, because 18691045 - 2⁹ = 18690533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18691045.

It is a congruent number.

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, 1869100 + ... + 1869109.

It is an arithmetic number, because the mean of its divisors is an integer number (5607315).

Almost surely, 2^18691045 is an apocalyptic number.

It is an amenable number.

18691045 is a deficient number, since it is larger than the sum of its proper divisors (3738215).

18691045 is an equidigital number, since it uses as much as digits as its factorization.

18691045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3738214.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18691045 is about 4323.3141222909. The cubic root of 18691045 is about 265.3859097950.

The spelling of 18691045 in words is "eighteen million, six hundred ninety-one thousand, forty-five".