12499561 has 2 divisors, whose sum is σ = 12499562. Its totient is φ = 12499560.

The previous prime is 12499537. The next prime is 12499577. The reversal of 12499561 is 16599421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11689561 + 810000 = 3419^2 + 900^2 .

It is a cyclic number.

It is not a de Polignac number, because 12499561 - 2¹⁹ = 11975273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12499561.

It is not a weakly prime, because it can be changed into another prime (12499661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6249780 + 6249781.

It is an arithmetic number, because the mean of its divisors is an integer number (6249781).

Almost surely, 2^12499561 is an apocalyptic number.

It is an amenable number.

12499561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12499561 is an equidigital number, since it uses as much as digits as its factorization.

12499561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 12499561 is about 3535.4718214122. The cubic root of 12499561 is about 232.0767247722.

The spelling of 12499561 in words is "twelve million, four hundred ninety-nine thousand, five hundred sixty-one".