9991298 has 4 divisors (see below), whose sum is σ = 14986950. Its totient is φ = 4995648.

The previous prime is 9991297. The next prime is 9991301. The reversal of 9991298 is 8921999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8921999 = 23 ⋅387913.

It can be written as a sum of positive squares in only one way, i.e., 9966649 + 24649 = 3157^2 + 157^2 .

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 as a sum of consecutive naturals, namely, 2497823 + ... + 2497826.

Almost surely, 2^9991298 is an apocalyptic number.

9991298 is a deficient number, since it is larger than the sum of its proper divisors (4995652).

9991298 is a wasteful number, since it uses less digits than its factorization.

9991298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995651.

The product of its digits is 104976, while the sum is 47.

The square root of 9991298 is about 3160.9014536996. The cubic root of 9991298 is about 215.3809578984.

The spelling of 9991298 in words is "nine million, nine hundred ninety-one thousand, two hundred ninety-eight".