121155799 has 4 divisors (see below), whose sum is σ = 127532440. Its totient is φ = 114779160.

The previous prime is 121155767. The next prime is 121155803. The reversal of 121155799 is 997551121.

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 121155799 - 2⁵ = 121155767 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 (121155709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3188292 + ... + 3188329.

It is an arithmetic number, because the mean of its divisors is an integer number (31883110).

Almost surely, 2^121155799 is an apocalyptic number.

121155799 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121155799 is a deficient number, since it is larger than the sum of its proper divisors (6376641).

121155799 is an equidigital number, since it uses as much as digits as its factorization.

121155799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6376640.

The product of its digits is 28350, while the sum is 40.

The square root of 121155799 is about 11007.0794945798. The cubic root of 121155799 is about 494.8209385330.

The spelling of 121155799 in words is "one hundred twenty-one million, one hundred fifty-five thousand, seven hundred ninety-nine".