12109571 has 2 divisors, whose sum is σ = 12109572. Its totient is φ = 12109570.

The previous prime is 12109553. The next prime is 12109579. The reversal of 12109571 is 17590121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12109571 - 2⁶ = 12109507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12109571.

It is not a weakly prime, because it can be changed into another prime (12109579) 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 as a sum of consecutive naturals, namely, 6054785 + 6054786.

It is an arithmetic number, because the mean of its divisors is an integer number (6054786).

Almost surely, 2^12109571 is an apocalyptic number.

12109571 is a deficient number, since it is larger than the sum of its proper divisors (1).

12109571 is an equidigital number, since it uses as much as digits as its factorization.

12109571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 12109571 is about 3479.8808887662. The cubic root of 12109571 is about 229.6375576948.

Adding to 12109571 its reverse (17590121), we get a palindrome (29699692).

The spelling of 12109571 in words is "twelve million, one hundred nine thousand, five hundred seventy-one".