126613009 has 2 divisors, whose sum is σ = 126613010. Its totient is φ = 126613008.

The previous prime is 126613007. The next prime is 126613037. The reversal of 126613009 is 900316621.

It is an a-pointer prime, because the next prime (126613037) can be obtained adding 126613009 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94633984 + 31979025 = 9728^2 + 5655^2 .

It is an emirp because it is prime and its reverse (900316621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126613009 - 2¹ = 126613007 is a prime.

Together with 126613007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (126613007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63306504 + 63306505.

It is an arithmetic number, because the mean of its divisors is an integer number (63306505).

Almost surely, 2^126613009 is an apocalyptic number.

It is an amenable number.

126613009 is a deficient number, since it is larger than the sum of its proper divisors (1).

126613009 is an equidigital number, since it uses as much as digits as its factorization.

126613009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 126613009 is about 11252.2446205191. The cubic root of 126613009 is about 502.1414935826.

The spelling of 126613009 in words is "one hundred twenty-six million, six hundred thirteen thousand, nine".