18891053 has 4 divisors (see below), whose sum is σ = 19401660. Its totient is φ = 18380448.

The previous prime is 18891043. The next prime is 18891071. The reversal of 18891053 is 35019881.

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 8631844 + 10259209 = 2938^2 + 3203^2 .

It is a cyclic number.

It is not a de Polignac number, because 18891053 - 2²⁰ = 17842477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18891023) 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, 255248 + ... + 255321.

It is an arithmetic number, because the mean of its divisors is an integer number (4850415).

Almost surely, 2^18891053 is an apocalyptic number.

It is an amenable number.

18891053 is a deficient number, since it is larger than the sum of its proper divisors (510607).

18891053 is an equidigital number, since it uses as much as digits as its factorization.

18891053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510606.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18891053 is about 4346.3838992892. The cubic root of 18891053 is about 266.3291617346.

The spelling of 18891053 in words is "eighteen million, eight hundred ninety-one thousand, fifty-three".