120915891 has 12 divisors (see below), whose sum is σ = 174924568. Its totient is φ = 80486784.

The previous prime is 120915869. The next prime is 120915901. The reversal of 120915891 is 198519021.

It is not a de Polignac number, because 120915891 - 2⁵ = 120915859 is a prime.

It is a super-3 number, since 3×120915891³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120915391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3925 + ... + 16038.

Almost surely, 2^120915891 is an apocalyptic number.

120915891 is a deficient number, since it is larger than the sum of its proper divisors (54008677).

120915891 is a wasteful number, since it uses less digits than its factorization.

120915891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20642 (or 20639 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 120915891 is about 10996.1761990248. The cubic root of 120915891 is about 494.4941143255.

The spelling of 120915891 in words is "one hundred twenty million, nine hundred fifteen thousand, eight hundred ninety-one".