12120561 has 6 divisors (see below), whose sum is σ = 17507490. Its totient is φ = 8080368.

The previous prime is 12120533. The next prime is 12120569. The reversal of 12120561 is 16502121.

12120561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6922161 + 5198400 = 2631^2 + 2280^2 .

It is not a de Polignac number, because 12120561 - 2⁹ = 12120049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12120569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 673356 + ... + 673373.

It is an arithmetic number, because the mean of its divisors is an integer number (2917915).

Almost surely, 2^12120561 is an apocalyptic number.

It is an amenable number.

12120561 is a deficient number, since it is larger than the sum of its proper divisors (5386929).

12120561 is a wasteful number, since it uses less digits than its factorization.

12120561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346735 (or 1346732 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 12120561 is about 3481.4596076933. The cubic root of 12120561 is about 229.7070056182.

Adding to 12120561 its reverse (16502121), we get a palindrome (28622682).

The spelling of 12120561 in words is "twelve million, one hundred twenty thousand, five hundred sixty-one".