180121 has 4 divisors (see below), whose sum is σ = 181044. Its totient is φ = 179200.

The previous prime is 180097. The next prime is 180137. The reversal of 180121 is 121081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 144400 + 35721 = 380^2 + 189^2 .

It is a cyclic number.

It is not a de Polignac number, because 180121 - 2¹³ = 171929 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180161) 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, 40 + ... + 601.

It is an arithmetic number, because the mean of its divisors is an integer number (45261).

2¹⁸⁰¹²¹ is an apocalyptic number.

It is an amenable number.

180121 is a deficient number, since it is larger than the sum of its proper divisors (923).

180121 is an equidigital number, since it uses as much as digits as its factorization.

180121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 180121 is about 424.4066446228. The cubic root of 180121 is about 56.4748106056.

The spelling of 180121 in words is "one hundred eighty thousand, one hundred twenty-one".