731009 has 8 divisors (see below), whose sum is σ = 784320. Its totient is φ = 679536.

The previous prime is 730999. The next prime is 731033. The reversal of 731009 is 900137.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 731009 - 2⁴ = 730993 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 731009.

It is not an unprimeable number, because it can be changed into a prime (731209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422 + ... + 1280.

It is an arithmetic number, because the mean of its divisors is an integer number (98040).

2⁷³¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

731009 is a deficient number, since it is larger than the sum of its proper divisors (53311).

731009 is a wasteful number, since it uses less digits than its factorization.

731009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919.

The product of its (nonzero) digits is 189, while the sum is 20.

The square root of 731009 is about 854.9906432237. The cubic root of 731009 is about 90.0825990672.

The spelling of 731009 in words is "seven hundred thirty-one thousand, nine".