9987617 has 2 divisors, whose sum is σ = 9987618. Its totient is φ = 9987616.

The previous prime is 9987577. The next prime is 9987643. The reversal of 9987617 is 7167899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7268416 + 2719201 = 2696^2 + 1649^2 .

It is a cyclic number.

It is not a de Polignac number, because 9987617 - 2⁶ = 9987553 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (9987317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993808 + 4993809.

It is an arithmetic number, because the mean of its divisors is an integer number (4993809).

Almost surely, 2^9987617 is an apocalyptic number.

It is an amenable number.

9987617 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987617 is an equidigital number, since it uses as much as digits as its factorization.

9987617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 47.

The square root of 9987617 is about 3160.3191294551. The cubic root of 9987617 is about 215.3545043889.

The spelling of 9987617 in words is "nine million, nine hundred eighty-seven thousand, six hundred seventeen".