126897709 has 2 divisors, whose sum is σ = 126897710. Its totient is φ = 126897708.

The previous prime is 126897703. The next prime is 126897761. The reversal of 126897709 is 907798621.

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., 77827684 + 49070025 = 8822^2 + 7005^2 .

It is an emirp because it is prime and its reverse (907798621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126897709 - 2⁷ = 126897581 is a prime.

It is a super-2 number, since 2×126897709² = 32206057098897362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126897703) 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, 63448854 + 63448855.

It is an arithmetic number, because the mean of its divisors is an integer number (63448855).

Almost surely, 2^126897709 is an apocalyptic number.

It is an amenable number.

126897709 is a deficient number, since it is larger than the sum of its proper divisors (1).

126897709 is an equidigital number, since it uses as much as digits as its factorization.

126897709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 126897709 is about 11264.8883261220. Note that the first 3 decimals coincide. The cubic root of 126897709 is about 502.5175809629.

The spelling of 126897709 in words is "one hundred twenty-six million, eight hundred ninety-seven thousand, seven hundred nine".