12371561 has 2 divisors, whose sum is σ = 12371562. Its totient is φ = 12371560.

The previous prime is 12371551. The next prime is 12371629. The reversal of 12371561 is 16517321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 295936 = 3475^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 12371561 - 2⁶ = 12371497 is a prime.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12371561.

It is not a weakly prime, because it can be changed into another prime (12371521) 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 as a sum of consecutive naturals, namely, 6185780 + 6185781.

It is an arithmetic number, because the mean of its divisors is an integer number (6185781).

Almost surely, 2^12371561 is an apocalyptic number.

It is an amenable number.

12371561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12371561 is an equidigital number, since it uses as much as digits as its factorization.

12371561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 26.

The square root of 12371561 is about 3517.3229877280. The cubic root of 12371561 is about 231.2818221608.

Adding to 12371561 its reverse (16517321), we get a palindrome (28888882).

Subtracting 12371561 from its reverse (16517321), we obtain a triangular number (4145760 = T₂₈₇₉).

The spelling of 12371561 in words is "twelve million, three hundred seventy-one thousand, five hundred sixty-one".