121749199 has 8 divisors (see below), whose sum is σ = 143034192. Its totient is φ = 102167040.

The previous prime is 121749197. The next prime is 121749209. The reversal of 121749199 is 991947121.

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

It is a cyclic number.

It is not a de Polignac number, because 121749199 - 2¹ = 121749197 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 (121749197) 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 7 ways as a sum of consecutive naturals, for example, 425554 + ... + 425839.

It is an arithmetic number, because the mean of its divisors is an integer number (17879274).

Almost surely, 2^121749199 is an apocalyptic number.

121749199 is a deficient number, since it is larger than the sum of its proper divisors (21284993).

121749199 is a wasteful number, since it uses less digits than its factorization.

121749199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851417.

The product of its digits is 40824, while the sum is 43.

The square root of 121749199 is about 11034.0019485226. The cubic root of 121749199 is about 495.6274721312.

Subtracting from 121749199 its sum of digits (43), we obtain a square (121749156 = 11034²).

The spelling of 121749199 in words is "one hundred twenty-one million, seven hundred forty-nine thousand, one hundred ninety-nine".