120891 has 8 divisors (see below), whose sum is σ = 164160. Its totient is φ = 79112.

The previous prime is 120889. The next prime is 120899. The reversal of 120891 is 198021.

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 120891 - 2¹ = 120889 is a prime.

It is a super-3 number, since 3×120891³ = 5300333113523913, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (120899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165 + ... + 518.

It is an arithmetic number, because the mean of its divisors is an integer number (20520).

2¹²⁰⁸⁹¹ is an apocalyptic number.

120891 is a deficient number, since it is larger than the sum of its proper divisors (43269).

120891 is an equidigital number, since it uses as much as digits as its factorization.

120891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 120891 is about 347.6938308340. The cubic root of 120891 is about 49.4460180827.

It can be divided in two parts, 12089 and 1, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 120891 in words is "one hundred twenty thousand, eight hundred ninety-one".