120561 has 8 divisors (see below), whose sum is σ = 183744. Its totient is φ = 68880.

The previous prime is 120557. The next prime is 120563. The reversal of 120561 is 165021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120561 - 2² = 120557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2850 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (22968).

2¹²⁰⁵⁶¹ is an apocalyptic number.

It is an amenable number.

120561 is a deficient number, since it is larger than the sum of its proper divisors (63183).

120561 is an equidigital number, since it uses as much as digits as its factorization.

120561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5751.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 120561 is about 347.2189510957. The cubic root of 120561 is about 49.4009856273.

Adding to 120561 its reverse (165021), we get a palindrome (285582).

The spelling of 120561 in words is "one hundred twenty thousand, five hundred sixty-one".