12582721 has 2 divisors, whose sum is σ = 12582722. Its totient is φ = 12582720.

The previous prime is 12582707. The next prime is 12582751. The reversal of 12582721 is 12728521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 409600 = 3489^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 12582721 - 2⁷ = 12582593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12582721.

It is not a weakly prime, because it can be changed into another prime (12582751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6291360 + 6291361.

It is an arithmetic number, because the mean of its divisors is an integer number (6291361).

Almost surely, 2^12582721 is an apocalyptic number.

It is an amenable number.

12582721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12582721 is an equidigital number, since it uses as much as digits as its factorization.

12582721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2240, while the sum is 28.

The square root of 12582721 is about 3547.2131314597. The cubic root of 12582721 is about 232.5902590169.

The spelling of 12582721 in words is "twelve million, five hundred eighty-two thousand, seven hundred twenty-one".