121587189 has 8 divisors (see below), whose sum is σ = 163087680. Its totient is φ = 80572416.

The previous prime is 121587173. The next prime is 121587229. The reversal of 121587189 is 981785121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121587189 - 2⁴ = 121587173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121587189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121587139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120844 + ... + 121845.

It is an arithmetic number, because the mean of its divisors is an integer number (20385960).

Almost surely, 2^121587189 is an apocalyptic number.

It is an amenable number.

121587189 is a deficient number, since it is larger than the sum of its proper divisors (41500491).

121587189 is a wasteful number, since it uses less digits than its factorization.

121587189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242859.

The product of its digits is 40320, while the sum is 42.

The square root of 121587189 is about 11026.6581066069. The cubic root of 121587189 is about 495.4075329713.

The spelling of 121587189 in words is "one hundred twenty-one million, five hundred eighty-seven thousand, one hundred eighty-nine".