120047991 has 12 divisors (see below), whose sum is σ = 186197112. Its totient is φ = 68598768.

The previous prime is 120047981. The next prime is 120048013. The reversal of 120047991 is 199740021.

It is not a de Polignac number, because 120047991 - 2⁹ = 120047479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120047911) 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 11 ways as a sum of consecutive naturals, for example, 408180 + ... + 408473.

It is an arithmetic number, because the mean of its divisors is an integer number (15516426).

Almost surely, 2^120047991 is an apocalyptic number.

120047991 is a deficient number, since it is larger than the sum of its proper divisors (66149121).

120047991 is an equidigital number, since it uses as much as digits as its factorization.

120047991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816670 (or 816663 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 120047991 is about 10956.6414105783. The cubic root of 120047991 is about 493.3081594268.

The spelling of 120047991 in words is "one hundred twenty million, forty-seven thousand, nine hundred ninety-one".