9986651 has 2 divisors, whose sum is σ = 9986652. Its totient is φ = 9986650.

The previous prime is 9986611. The next prime is 9986653. The reversal of 9986651 is 1566899.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9986651 is a prime.

Together with 9986653, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (9986653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993325 + 4993326.

It is an arithmetic number, because the mean of its divisors is an integer number (4993326).

Almost surely, 2^9986651 is an apocalyptic number.

9986651 is a deficient number, since it is larger than the sum of its proper divisors (1).

9986651 is an equidigital number, since it uses as much as digits as its factorization.

9986651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 9986651 is about 3160.1662930928. The cubic root of 9986651 is about 215.3475611525.

The spelling of 9986651 in words is "nine million, nine hundred eighty-six thousand, six hundred fifty-one".