18475121 has 4 divisors (see below), whose sum is σ = 21114432. Its totient is φ = 15835812.

The previous prime is 18475109. The next prime is 18475129. The reversal of 18475121 is 12157481.

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 18475121 - 2¹⁰ = 18474097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18475129) 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, 1319645 + ... + 1319658.

It is an arithmetic number, because the mean of its divisors is an integer number (5278608).

Almost surely, 2^18475121 is an apocalyptic number.

It is an amenable number.

18475121 is a deficient number, since it is larger than the sum of its proper divisors (2639311).

18475121 is an equidigital number, since it uses as much as digits as its factorization.

18475121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639310.

The product of its digits is 2240, while the sum is 29.

The square root of 18475121 is about 4298.2695355224. The cubic root of 18475121 is about 264.3600125449.

The spelling of 18475121 in words is "eighteen million, four hundred seventy-five thousand, one hundred twenty-one".