9906851 has 2 divisors, whose sum is σ = 9906852. Its totient is φ = 9906850.

The previous prime is 9906839. The next prime is 9906863. The reversal of 9906851 is 1586099.

9906851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (9906839) and next prime (9906863).

It is an emirp because it is prime and its reverse (1586099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9906851 - 2¹⁴ = 9890467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9906751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4953425 + 4953426.

It is an arithmetic number, because the mean of its divisors is an integer number (4953426).

Almost surely, 2^9906851 is an apocalyptic number.

9906851 is a deficient number, since it is larger than the sum of its proper divisors (1).

9906851 is an equidigital number, since it uses as much as digits as its factorization.

9906851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 9906851 is about 3147.5150515923. The cubic root of 9906851 is about 214.7724363463.

The spelling of 9906851 in words is "nine million, nine hundred six thousand, eight hundred fifty-one".