731216985 has 16 divisors (see below), whose sum is σ = 1170320064. Its totient is φ = 389858112.

The previous prime is 731216947. The next prime is 731216987. The reversal of 731216985 is 589612137.

It is not a de Polignac number, because 731216985 - 2¹⁸ = 730954841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (731216987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59859 + ... + 71031.

It is an arithmetic number, because the mean of its divisors is an integer number (73145004).

Almost surely, 2^731216985 is an apocalyptic number.

It is an amenable number.

731216985 is a deficient number, since it is larger than the sum of its proper divisors (439103079).

731216985 is a wasteful number, since it uses less digits than its factorization.

731216985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15544.

The product of its digits is 90720, while the sum is 42.

The square root of 731216985 is about 27041.0241115236. The cubic root of 731216985 is about 900.9114162174.

The spelling of 731216985 in words is "seven hundred thirty-one million, two hundred sixteen thousand, nine hundred eighty-five".