126650009 has 2 divisors, whose sum is σ = 126650010. Its totient is φ = 126650008.

The previous prime is 126649997. The next prime is 126650021. The reversal of 126650009 is 900056621.

It is a balanced prime because it is at equal distance from previous prime (126649997) and next prime (126650021).

It can be written as a sum of positive squares in only one way, i.e., 124099600 + 2550409 = 11140^2 + 1597^2 .

It is an emirp because it is prime and its reverse (900056621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126650009 - 2⁴ = 126649993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126650099) 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, 63325004 + 63325005.

It is an arithmetic number, because the mean of its divisors is an integer number (63325005).

Almost surely, 2^126650009 is an apocalyptic number.

It is an amenable number.

126650009 is a deficient number, since it is larger than the sum of its proper divisors (1).

126650009 is an equidigital number, since it uses as much as digits as its factorization.

126650009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 126650009 is about 11253.8886168293. Note that the first 3 decimals coincide. The cubic root of 126650009 is about 502.1904022635.

The spelling of 126650009 in words is "one hundred twenty-six million, six hundred fifty thousand, nine".