18985271 has 4 divisors (see below), whose sum is σ = 19090344. Its totient is φ = 18880200.

The previous prime is 18985261. The next prime is 18985279. The reversal of 18985271 is 17258981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17258981 = 101 ⋅170881.

It is a cyclic number.

It is not a de Polignac number, because 18985271 - 2⁶ = 18985207 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 (18985279) 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, 52265 + ... + 52626.

It is an arithmetic number, because the mean of its divisors is an integer number (4772586).

Almost surely, 2^18985271 is an apocalyptic number.

18985271 is a deficient number, since it is larger than the sum of its proper divisors (105073).

18985271 is a wasteful number, since it uses less digits than its factorization.

18985271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105072.

The product of its digits is 40320, while the sum is 41.

The square root of 18985271 is about 4357.2090838058. The cubic root of 18985271 is about 266.7711946121.

The spelling of 18985271 in words is "eighteen million, nine hundred eighty-five thousand, two hundred seventy-one".