731320985 has 12 divisors (see below), whose sum is σ = 908895468. Its totient is φ = 564879168.

The previous prime is 731320981. The next prime is 731321023. The reversal of 731320985 is 589023137.

731320985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 5180176 + 726140809 = 2276^2 + 26947^2 .

It is not a de Polignac number, because 731320985 - 2² = 731320981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731320981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82754 + ... + 91163.

It is an arithmetic number, because the mean of its divisors is an integer number (75741289).

Almost surely, 2^731320985 is an apocalyptic number.

It is an amenable number.

731320985 is a deficient number, since it is larger than the sum of its proper divisors (177574483).

731320985 is a wasteful number, since it uses less digits than its factorization.

731320985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173980 (or 173951 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 731320985 is about 27042.9470472432. The cubic root of 731320985 is about 900.9541259955.

The spelling of 731320985 in words is "seven hundred thirty-one million, three hundred twenty thousand, nine hundred eighty-five".