744999809 has 2 divisors, whose sum is σ = 744999810. Its totient is φ = 744999808.

The previous prime is 744999803. The next prime is 744999833. The reversal of 744999809 is 908999447.

It is a happy number.

744999809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 738317584 + 6682225 = 27172^2 + 2585^2 .

It is an emirp because it is prime and its reverse (908999447) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-744999809 is a prime.

It is not a weakly prime, because it can be changed into another prime (744999803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372499904 + 372499905.

It is an arithmetic number, because the mean of its divisors is an integer number (372499905).

Almost surely, 2^744999809 is an apocalyptic number.

It is an amenable number.

744999809 is a deficient number, since it is larger than the sum of its proper divisors (1).

744999809 is an equidigital number, since it uses as much as digits as its factorization.

744999809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The square root of 744999809 is about 27294.6846290629. The cubic root of 744999809 is about 906.5366926546.

The spelling of 744999809 in words is "seven hundred forty-four million, nine hundred ninety-nine thousand, eight hundred nine".