121139189 has 4 divisors (see below), whose sum is σ = 121206624. Its totient is φ = 121071756.

The previous prime is 121139173. The next prime is 121139191. The reversal of 121139189 is 981931121.

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 an emirpimes, since its reverse is a distinct semiprime: 981931121 = 449 ⋅2186929.

It is a cyclic number.

It is not a de Polignac number, because 121139189 - 2⁴ = 121139173 is a prime.

It is a super-3 number, since 3×121139189³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121139489) 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, 30947 + ... + 34640.

It is an arithmetic number, because the mean of its divisors is an integer number (30301656).

Almost surely, 2^121139189 is an apocalyptic number.

It is an amenable number.

121139189 is a deficient number, since it is larger than the sum of its proper divisors (67435).

121139189 is an equidigital number, since it uses as much as digits as its factorization.

121139189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67434.

The product of its digits is 3888, while the sum is 35.

The square root of 121139189 is about 11006.3249543160. The cubic root of 121139189 is about 494.7983248090.

The spelling of 121139189 in words is "one hundred twenty-one million, one hundred thirty-nine thousand, one hundred eighty-nine".