12039561 has 6 divisors (see below), whose sum is σ = 17390490. Its totient is φ = 8026368.

The previous prime is 12039539. The next prime is 12039569. The reversal of 12039561 is 16593021.

12039561 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., 11431161 + 608400 = 3381^2 + 780^2 .

It is not a de Polignac number, because 12039561 - 2⁶ = 12039497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12039569) 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, 668856 + ... + 668873.

It is an arithmetic number, because the mean of its divisors is an integer number (2898415).

Almost surely, 2^12039561 is an apocalyptic number.

It is an amenable number.

12039561 is a deficient number, since it is larger than the sum of its proper divisors (5350929).

12039561 is a wasteful number, since it uses less digits than its factorization.

12039561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337735 (or 1337732 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 12039561 is about 3469.8070551545. The cubic root of 12039561 is about 229.1941616524.

The spelling of 12039561 in words is "twelve million, thirty-nine thousand, five hundred sixty-one".