18573121 has 8 divisors (see below), whose sum is σ = 22149504. Its totient is φ = 15227520.

The previous prime is 18573109. The next prime is 18573157. The reversal of 18573121 is 12137581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18573121 - 2¹³ = 18564929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18573121.

It is not an unprimeable number, because it can be changed into a prime (18573101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57520 + ... + 57841.

It is an arithmetic number, because the mean of its divisors is an integer number (2768688).

Almost surely, 2^18573121 is an apocalyptic number.

It is an amenable number.

18573121 is a deficient number, since it is larger than the sum of its proper divisors (3576383).

18573121 is a wasteful number, since it uses less digits than its factorization.

18573121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115391.

The product of its digits is 1680, while the sum is 28.

The square root of 18573121 is about 4309.6543944962. The cubic root of 18573121 is about 264.8266149549.

The spelling of 18573121 in words is "eighteen million, five hundred seventy-three thousand, one hundred twenty-one".