121288189 has 4 divisors (see below), whose sum is σ = 132314400. Its totient is φ = 110261980.

The previous prime is 121288171. The next prime is 121288199. The reversal of 121288189 is 981882121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121288189 - 2⁷ = 121288061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121288169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5513089 + ... + 5513110.

It is an arithmetic number, because the mean of its divisors is an integer number (33078600).

Almost surely, 2^121288189 is an apocalyptic number.

It is an amenable number.

121288189 is a deficient number, since it is larger than the sum of its proper divisors (11026211).

121288189 is a wasteful number, since it uses less digits than its factorization.

121288189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11026210.

The product of its digits is 18432, while the sum is 40.

The square root of 121288189 is about 11013.0917094157. The cubic root of 121288189 is about 495.0011073675.

It can be divided in two parts, 1212 and 88189, that added together give a square (89401 = 299²).

The spelling of 121288189 in words is "one hundred twenty-one million, two hundred eighty-eight thousand, one hundred eighty-nine".