120311999 has 4 divisors (see below), whose sum is σ = 123246480. Its totient is φ = 117377520.

The previous prime is 120311993. The next prime is 120312007. The reversal of 120311999 is 999113021.

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 120311999 - 2²⁰ = 119263423 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 (120311993) 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, 1467179 + ... + 1467260.

It is an arithmetic number, because the mean of its divisors is an integer number (30811620).

Almost surely, 2^120311999 is an apocalyptic number.

120311999 is a deficient number, since it is larger than the sum of its proper divisors (2934481).

120311999 is an equidigital number, since it uses as much as digits as its factorization.

120311999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934480.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 120311999 is about 10968.6826465169. The cubic root of 120311999 is about 493.6695203123.

The spelling of 120311999 in words is "one hundred twenty million, three hundred eleven thousand, nine hundred ninety-nine".