743278009 has 2 divisors, whose sum is σ = 743278010. Its totient is φ = 743278008.

The previous prime is 743278001. The next prime is 743278073. The reversal of 743278009 is 900872347.

743278009 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., 728838009 + 14440000 = 26997^2 + 3800^2 .

It is a cyclic number.

It is not a de Polignac number, because 743278009 - 2³ = 743278001 is a prime.

It is not a weakly prime, because it can be changed into another prime (743278001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371639004 + 371639005.

It is an arithmetic number, because the mean of its divisors is an integer number (371639005).

Almost surely, 2^743278009 is an apocalyptic number.

It is an amenable number.

743278009 is a deficient number, since it is larger than the sum of its proper divisors (1).

743278009 is an equidigital number, since it uses as much as digits as its factorization.

743278009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 743278009 is about 27263.1254444534. The cubic root of 743278009 is about 905.8377757455.

The spelling of 743278009 in words is "seven hundred forty-three million, two hundred seventy-eight thousand, nine".