9991395479 has 8 divisors (see below), whose sum is σ = 10762019520. Its totient is φ = 9221065056.

The previous prime is 9991395473. The next prime is 9991395481. The reversal of 9991395479 is 9745931999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9991395479 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 (9991395473) 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, 2 + ... + 141360.

It is an arithmetic number, because the mean of its divisors is an integer number (1345252440).

Almost surely, 2^9991395479 is an apocalyptic number.

9991395479 is a deficient number, since it is larger than the sum of its proper divisors (770624041).

9991395479 is a wasteful number, since it uses less digits than its factorization.

9991395479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146809.

The product of its digits is 24800580, while the sum is 65.

The square root of 9991395479 is about 99956.9681362935. The cubic root of 9991395479 is about 2153.8165834298.

The spelling of 9991395479 in words is "nine billion, nine hundred ninety-one million, three hundred ninety-five thousand, four hundred seventy-nine".