9170731665 has 24 divisors (see below), whose sum is σ = 15899293800. Its totient is φ = 4890023424.

The previous prime is 9170731657. The next prime is 9170731747. The reversal of 9170731665 is 5661370719.

It can be written as a sum of positive squares in 4 ways, for example, as 1815782544 + 7354949121 = 42612^2 + 85761^2 .

It is not a de Polignac number, because 9170731665 - 2³ = 9170731657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 9170731665.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 224761 + ... + 262409.

It is an arithmetic number, because the mean of its divisors is an integer number (662470575).

Almost surely, 2^9170731665 is an apocalyptic number.

It is an amenable number.

9170731665 is a deficient number, since it is larger than the sum of its proper divisors (6728562135).

9170731665 is a wasteful number, since it uses less digits than its factorization.

9170731665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43073 (or 43070 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 9170731665 is about 95763.9371840987. The cubic root of 9170731665 is about 2093.1547074959.

The spelling of 9170731665 in words is "nine billion, one hundred seventy million, seven hundred thirty-one thousand, six hundred sixty-five".