9991299 has 8 divisors (see below), whose sum is σ = 13356880. Its totient is φ = 6643296.

The previous prime is 9991297. The next prime is 9991301. The reversal of 9991299 is 9921999.

It is an interprime number because it is at equal distance from previous prime (9991297) and next prime (9991301).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9991299 - 2¹ = 9991297 is a prime.

It is a Duffinian number.

9991299 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991297) 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, 3004 + ... + 5385.

It is an arithmetic number, because the mean of its divisors is an integer number (1669610).

Almost surely, 2^9991299 is an apocalyptic number.

9991299 is a deficient number, since it is larger than the sum of its proper divisors (3365581).

9991299 is a wasteful number, since it uses less digits than its factorization.

9991299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8789.

The product of its digits is 118098, while the sum is 48.

The square root of 9991299 is about 3160.9016118823. The cubic root of 9991299 is about 215.3809650840.

The spelling of 9991299 in words is "nine million, nine hundred ninety-one thousand, two hundred ninety-nine".