189121 has 4 divisors (see below), whose sum is σ = 190000. Its totient is φ = 188244.

The previous prime is 189067. The next prime is 189127. The reversal of 189121 is 121981.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 121981 = 223 ⋅547.

It is a cyclic number.

It is not a de Polignac number, because 189121 - 2⁹ = 188609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189092 and 189101.

It is not an unprimeable number, because it can be changed into a prime (189127) 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, 130 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (47500).

2¹⁸⁹¹²¹ is an apocalyptic number.

It is an amenable number.

189121 is a deficient number, since it is larger than the sum of its proper divisors (879).

189121 is an equidigital number, since it uses as much as digits as its factorization.

189121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878.

The product of its digits is 144, while the sum is 22.

The square root of 189121 is about 434.8804433405. The cubic root of 189121 is about 57.4001796787.

The spelling of 189121 in words is "one hundred eighty-nine thousand, one hundred twenty-one".