120861 has 12 divisors (see below), whose sum is σ = 188188. Its totient is φ = 74304.

The previous prime is 120851. The next prime is 120863. The reversal of 120861 is 168021.

It can be written as a sum of positive squares in 2 ways, for example, as 72900 + 47961 = 270^2 + 219^2 .

It is not a de Polignac number, because 120861 - 2⁵ = 120829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120863) 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, 400 + ... + 633.

2¹²⁰⁸⁶¹ is an apocalyptic number.

It is an amenable number.

120861 is a deficient number, since it is larger than the sum of its proper divisors (67327).

120861 is a wasteful number, since it uses less digits than its factorization.

120861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 120861 is about 347.6506867532. The cubic root of 120861 is about 49.4419276120.

Adding to 120861 its reverse (168021), we get a palindrome (288882).

The spelling of 120861 in words is "one hundred twenty thousand, eight hundred sixty-one".