731746321 has 8 divisors (see below), whose sum is σ = 739884200. Its totient is φ = 723634560.

The previous prime is 731746273. The next prime is 731746331. The reversal of 731746321 is 123647137.

It can be written as a sum of positive squares in 4 ways, for example, as 12702096 + 719044225 = 3564^2 + 26815^2 .

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 731746321 - 2⁷ = 731746193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731746331) 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, 52765 + ... + 65173.

It is an arithmetic number, because the mean of its divisors is an integer number (92485525).

Almost surely, 2^731746321 is an apocalyptic number.

It is an amenable number.

731746321 is a deficient number, since it is larger than the sum of its proper divisors (8137879).

731746321 is a wasteful number, since it uses less digits than its factorization.

731746321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13059.

The product of its digits is 21168, while the sum is 34.

The square root of 731746321 is about 27050.8099878728. The cubic root of 731746321 is about 901.1287570010.

The spelling of 731746321 in words is "seven hundred thirty-one million, seven hundred forty-six thousand, three hundred twenty-one".