121081189 has 4 divisors (see below), whose sum is σ = 121344300. Its totient is φ = 120818080.

The previous prime is 121081183. The next prime is 121081193. The reversal of 121081189 is 981180121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 981180121 = 19 ⋅51641059.

It can be written as a sum of positive squares in 2 ways, for example, as 63473089 + 57608100 = 7967^2 + 7590^2 .

It is a cyclic number.

It is not a de Polignac number, because 121081189 - 2⁹ = 121080677 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 121081189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121081183) 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, 130864 + ... + 131785.

It is an arithmetic number, because the mean of its divisors is an integer number (30336075).

Almost surely, 2^121081189 is an apocalyptic number.

It is an amenable number.

121081189 is a deficient number, since it is larger than the sum of its proper divisors (263111).

121081189 is an equidigital number, since it uses as much as digits as its factorization.

121081189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263110.

The product of its (nonzero) digits is 1152, while the sum is 31.

The square root of 121081189 is about 11003.6897902476. The cubic root of 121081189 is about 494.7193443557.

The spelling of 121081189 in words is "one hundred twenty-one million, eighty-one thousand, one hundred eighty-nine".