121157999 has 8 divisors (see below), whose sum is σ = 122686368. Its totient is φ = 119639520.

The previous prime is 121157989. The next prime is 121158001. The reversal of 121157999 is 999751121.

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 121157999 - 2⁴ = 121157983 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 (121157989) 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, 23909 + ... + 28529.

It is an arithmetic number, because the mean of its divisors is an integer number (15335796).

Almost surely, 2^121157999 is an apocalyptic number.

121157999 is a deficient number, since it is larger than the sum of its proper divisors (1528369).

121157999 is a wasteful number, since it uses less digits than its factorization.

121157999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4945.

The product of its digits is 51030, while the sum is 44.

The square root of 121157999 is about 11007.1794298085. The cubic root of 121157999 is about 494.8239335733.

The spelling of 121157999 in words is "one hundred twenty-one million, one hundred fifty-seven thousand, nine hundred ninety-nine".