12027561 has 24 divisors (see below), whose sum is σ = 19851840. Its totient is φ = 6342336.

The previous prime is 12027557. The next prime is 12027571. The reversal of 12027561 is 16572021.

12027561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12027561 - 2² = 12027557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12027511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1855 + ... + 5243.

It is an arithmetic number, because the mean of its divisors is an integer number (827160).

Almost surely, 2^12027561 is an apocalyptic number.

It is an amenable number.

12027561 is a deficient number, since it is larger than the sum of its proper divisors (7824279).

12027561 is a wasteful number, since it uses less digits than its factorization.

12027561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425 (or 3412 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 12027561 is about 3468.0774212811. The cubic root of 12027561 is about 229.1179893232.

Adding to 12027561 its reverse (16572021), we get a palindrome (28599582).

The spelling of 12027561 in words is "twelve million, twenty-seven thousand, five hundred sixty-one".