15680317 has 4 divisors (see below), whose sum is σ = 15749020. Its totient is φ = 15611616.

The previous prime is 15680311. The next prime is 15680321. The reversal of 15680317 is 71308651.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8357881 + 7322436 = 2891^2 + 2706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15680317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15680311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34008 + ... + 34465.

It is an arithmetic number, because the mean of its divisors is an integer number (3937255).

Almost surely, 2^15680317 is an apocalyptic number.

It is an amenable number.

15680317 is a deficient number, since it is larger than the sum of its proper divisors (68703).

15680317 is an equidigital number, since it uses as much as digits as its factorization.

15680317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68702.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 15680317 is about 3959.8380017369. The cubic root of 15680317 is about 250.2946765265.

Adding to 15680317 its reverse (71308651), we get a palindrome (86988968).

The spelling of 15680317 in words is "fifteen million, six hundred eighty thousand, three hundred seventeen".