18191053 has 4 divisors (see below), whose sum is σ = 18330048. Its totient is φ = 18052060.

The previous prime is 18191039. The next prime is 18191077. The reversal of 18191053 is 35019181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18191053 - 2⁹ = 18190541 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 (18191023) 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, 69301 + ... + 69562.

It is an arithmetic number, because the mean of its divisors is an integer number (4582512).

Almost surely, 2^18191053 is an apocalyptic number.

It is an amenable number.

18191053 is a deficient number, since it is larger than the sum of its proper divisors (138995).

18191053 is a wasteful number, since it uses less digits than its factorization.

18191053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138994.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18191053 is about 4265.0970680630. The cubic root of 18191053 is about 262.9981012552.

The spelling of 18191053 in words is "eighteen million, one hundred ninety-one thousand, fifty-three".