12746509 has 2 divisors, whose sum is σ = 12746510. Its totient is φ = 12746508.

The previous prime is 12746483. The next prime is 12746519. The reversal of 12746509 is 90564721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12320100 + 426409 = 3510^2 + 653^2 .

It is a cyclic number.

It is not a de Polignac number, because 12746509 - 2⁷ = 12746381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12746519) 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, 6373254 + 6373255.

It is an arithmetic number, because the mean of its divisors is an integer number (6373255).

Almost surely, 2^12746509 is an apocalyptic number.

It is an amenable number.

12746509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12746509 is an equidigital number, since it uses as much as digits as its factorization.

12746509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 12746509 is about 3570.2253430281. The cubic root of 12746509 is about 233.5951127727.

The spelling of 12746509 in words is "twelve million, seven hundred forty-six thousand, five hundred nine".