18580121 has 4 divisors (see below), whose sum is σ = 21234432. Its totient is φ = 15925812.

The previous prime is 18580117. The next prime is 18580127. The reversal of 18580121 is 12108581.

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 not a de Polignac number, because 18580121 - 2² = 18580117 is a prime.

It is a super-3 number, since 3×18580121³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18580127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1327145 + ... + 1327158.

It is an arithmetic number, because the mean of its divisors is an integer number (5308608).

Almost surely, 2^18580121 is an apocalyptic number.

It is an amenable number.

18580121 is a deficient number, since it is larger than the sum of its proper divisors (2654311).

18580121 is an equidigital number, since it uses as much as digits as its factorization.

18580121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654310.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 18580121 is about 4310.4664480773. The cubic root of 18580121 is about 264.8598808317.

It can be divided in two parts, 185801 and 21, that multiplied together give a triangular number (3901821 = T₂₇₉₃).

The spelling of 18580121 in words is "eighteen million, five hundred eighty thousand, one hundred twenty-one".