126713309 has 2 divisors, whose sum is σ = 126713310. Its totient is φ = 126713308.

The previous prime is 126713273. The next prime is 126713347. The reversal of 126713309 is 903317621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115132900 + 11580409 = 10730^2 + 3403^2 .

It is an emirp because it is prime and its reverse (903317621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126713309 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 (126713369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63356654 + 63356655.

It is an arithmetic number, because the mean of its divisors is an integer number (63356655).

Almost surely, 2^126713309 is an apocalyptic number.

It is an amenable number.

126713309 is a deficient number, since it is larger than the sum of its proper divisors (1).

126713309 is an equidigital number, since it uses as much as digits as its factorization.

126713309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 126713309 is about 11256.7006267378. The cubic root of 126713309 is about 502.2740536799.

The spelling of 126713309 in words is "one hundred twenty-six million, seven hundred thirteen thousand, three hundred nine".