12649709 has 2 divisors, whose sum is σ = 12649710. Its totient is φ = 12649708.

The previous prime is 12649699. The next prime is 12649727. The reversal of 12649709 is 90794621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10465225 + 2184484 = 3235^2 + 1478^2 .

It is a cyclic number.

It is not a de Polignac number, because 12649709 - 2⁸ = 12649453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12649729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6324854 + 6324855.

It is an arithmetic number, because the mean of its divisors is an integer number (6324855).

Almost surely, 2^12649709 is an apocalyptic number.

It is an amenable number.

12649709 is a deficient number, since it is larger than the sum of its proper divisors (1).

12649709 is an equidigital number, since it uses as much as digits as its factorization.

12649709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 12649709 is about 3556.6429396272. The cubic root of 12649709 is about 233.0022840499.

The spelling of 12649709 in words is "twelve million, six hundred forty-nine thousand, seven hundred nine".