18600121 has 4 divisors (see below), whose sum is σ = 18635044. Its totient is φ = 18565200.

The previous prime is 18600097. The next prime is 18600133. The reversal of 18600121 is 12100681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4243600 + 14356521 = 2060^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 18600121 - 2⁵ = 18600089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18600151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16650 + ... + 17731.

It is an arithmetic number, because the mean of its divisors is an integer number (4658761).

Almost surely, 2^18600121 is an apocalyptic number.

It is an amenable number.

18600121 is a deficient number, since it is larger than the sum of its proper divisors (34923).

18600121 is an equidigital number, since it uses as much as digits as its factorization.

18600121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34922.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 18600121 is about 4312.7857586483. The cubic root of 18600121 is about 264.9548801786.

It can be divided in two parts, 18600 and 121, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 18600121 in words is "eighteen million, six hundred thousand, one hundred twenty-one".