991303879 has 8 divisors (see below), whose sum is σ = 1002767040. Its totient is φ = 979884000.

The previous prime is 991303867. The next prime is 991303883. The reversal of 991303879 is 978303199.

991303879 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 a cyclic number.

It is not a de Polignac number, because 991303879 - 2¹⁷ = 991172807 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 (991373879) 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, 36429 + ... + 57529.

It is an arithmetic number, because the mean of its divisors is an integer number (125345880).

Almost surely, 2^991303879 is an apocalyptic number.

991303879 is a deficient number, since it is larger than the sum of its proper divisors (11463161).

991303879 is a wasteful number, since it uses less digits than its factorization.

991303879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21641.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 991303879 is about 31484.9786247347. The cubic root of 991303879 is about 997.0928496669.

The spelling of 991303879 in words is "nine hundred ninety-one million, three hundred three thousand, eight hundred seventy-nine".