121643199 has 6 divisors (see below), whose sum is σ = 175706856. Its totient is φ = 81095460.

The previous prime is 121643167. The next prime is 121643213. The reversal of 121643199 is 991346121.

It is a happy number.

121643199 is a `hidden beast` number, since 1 + 2 + 1 + 643 + 1 + 9 + 9 = 666.

It is not a de Polignac number, because 121643199 - 2⁵ = 121643167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121643099) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6757947 + ... + 6757964.

It is an arithmetic number, because the mean of its divisors is an integer number (29284476).

Almost surely, 2^121643199 is an apocalyptic number.

121643199 is a deficient number, since it is larger than the sum of its proper divisors (54063657).

121643199 is a wasteful number, since it uses less digits than its factorization.

121643199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13515917 (or 13515914 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 121643199 is about 11029.1975682730. The cubic root of 121643199 is about 495.4835922900.

The spelling of 121643199 in words is "one hundred twenty-one million, six hundred forty-three thousand, one hundred ninety-nine".