12007561 has 2 divisors, whose sum is σ = 12007562. Its totient is φ = 12007560.

The previous prime is 12007553. The next prime is 12007577. The reversal of 12007561 is 16570021.

12007561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 447561 = 3400^2 + 669^2 .

It is a cyclic number.

It is not a de Polignac number, because 12007561 - 2³ = 12007553 is a prime.

It is not a weakly prime, because it can be changed into another prime (12007511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6003780 + 6003781.

It is an arithmetic number, because the mean of its divisors is an integer number (6003781).

Almost surely, 2^12007561 is an apocalyptic number.

It is an amenable number.

12007561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12007561 is an equidigital number, since it uses as much as digits as its factorization.

12007561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 12007561 is about 3465.1927796300. The cubic root of 12007561 is about 228.9909227729.

Adding to 12007561 its reverse (16570021), we get a palindrome (28577582).

The spelling of 12007561 in words is "twelve million, seven thousand, five hundred sixty-one".