731243009 has 8 divisors (see below), whose sum is σ = 835914240. Its totient is φ = 626623776.

The previous prime is 731243003. The next prime is 731243017. The reversal of 731243009 is 900342137.

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 731243009 - 2⁸ = 731242753 is a prime.

It is a super-2 number, since 2×731243009² = 1069432676422748162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (731243003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24272 + ... + 45294.

It is an arithmetic number, because the mean of its divisors is an integer number (104489280).

Almost surely, 2^731243009 is an apocalyptic number.

It is an amenable number.

731243009 is a deficient number, since it is larger than the sum of its proper divisors (104671231).

731243009 is a wasteful number, since it uses less digits than its factorization.

731243009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25999.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 731243009 is about 27041.5053020352. The cubic root of 731243009 is about 900.9221038979.

The spelling of 731243009 in words is "seven hundred thirty-one million, two hundred forty-three thousand, nine".