9799991 has 8 divisors (see below), whose sum is σ = 10348800. Its totient is φ = 9254520.

The previous prime is 9799987. The next prime is 9799997. The reversal of 9799991 is 1999979.

9799991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9799991 - 2² = 9799987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9799997) 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, 7346 + ... + 8576.

It is an arithmetic number, because the mean of its divisors is an integer number (1293600).

Almost surely, 2^9799991 is an apocalyptic number.

9799991 is a deficient number, since it is larger than the sum of its proper divisors (548809).

9799991 is a wasteful number, since it uses less digits than its factorization.

9799991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669.

The product of its digits is 413343, while the sum is 53.

The square root of 9799991 is about 3130.4937310271. The cubic root of 9799991 is about 213.9974306036.

The spelling of 9799991 in words is "nine million, seven hundred ninety-nine thousand, nine hundred ninety-one".