126320009 has 4 divisors (see below), whose sum is σ = 130394880. Its totient is φ = 122245140.

The previous prime is 126319997. The next prime is 126320011. The reversal of 126320009 is 900023621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126320009 - 2¹² = 126315913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126320039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2037389 + ... + 2037450.

It is an arithmetic number, because the mean of its divisors is an integer number (32598720).

Almost surely, 2^126320009 is an apocalyptic number.

It is an amenable number.

126320009 is a deficient number, since it is larger than the sum of its proper divisors (4074871).

126320009 is an equidigital number, since it uses as much as digits as its factorization.

126320009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074870.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 126320009 is about 11239.2174549654. The cubic root of 126320009 is about 501.7538528075.

The spelling of 126320009 in words is "one hundred twenty-six million, three hundred twenty thousand, nine".