121172399 has 4 divisors (see below), whose sum is σ = 121290960. Its totient is φ = 121053840.

The previous prime is 121172383. The next prime is 121172419. The reversal of 121172399 is 993271121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121172399 - 2⁴ = 121172383 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 (121172339) 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 3 ways as a sum of consecutive naturals, for example, 57734 + ... + 59795.

It is an arithmetic number, because the mean of its divisors is an integer number (30322740).

Almost surely, 2^121172399 is an apocalyptic number.

121172399 is a deficient number, since it is larger than the sum of its proper divisors (118561).

121172399 is a wasteful number, since it uses less digits than its factorization.

121172399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118560.

The product of its digits is 6804, while the sum is 35.

The square root of 121172399 is about 11007.8335289011. The cubic root of 121172399 is about 494.8435365777.

The spelling of 121172399 in words is "one hundred twenty-one million, one hundred seventy-two thousand, three hundred ninety-nine".