121879199 has 16 divisors (see below), whose sum is σ = 136298400. Its totient is φ = 108210816.

The previous prime is 121879189. The next prime is 121879207. The reversal of 121879199 is 991978121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121879199 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 (121879189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142457 + ... + 143309.

It is an arithmetic number, because the mean of its divisors is an integer number (8518650).

Almost surely, 2^121879199 is an apocalyptic number.

121879199 is a deficient number, since it is larger than the sum of its proper divisors (14419201).

121879199 is a wasteful number, since it uses less digits than its factorization.

121879199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274.

The product of its digits is 81648, while the sum is 47.

The square root of 121879199 is about 11039.8912585224. The cubic root of 121879199 is about 495.8038145708.

The spelling of 121879199 in words is "one hundred twenty-one million, eight hundred seventy-nine thousand, one hundred ninety-nine".