9991306 has 16 divisors (see below), whose sum is σ = 16214688. Its totient is φ = 4590000.

The previous prime is 9991301. The next prime is 9991313. The reversal of 9991306 is 6031999.

It is not an unprimeable number, because it can be changed into a prime (9991301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5761 + ... + 7291.

It is an arithmetic number, because the mean of its divisors is an integer number (1013418).

Almost surely, 2^9991306 is an apocalyptic number.

9991306 is a deficient number, since it is larger than the sum of its proper divisors (6223382).

9991306 is a wasteful number, since it uses less digits than its factorization.

9991306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1797.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 9991306 is about 3160.9027191611. The cubic root of 9991306 is about 215.3810153833.

The spelling of 9991306 in words is "nine million, nine hundred ninety-one thousand, three hundred six".