991303841 has 8 divisors (see below), whose sum is σ = 1128441024. Its totient is φ = 862003120.

The previous prime is 991303801. The next prime is 991303867. The reversal of 991303841 is 148303199.

It is a happy number.

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

It is not a de Polignac number, because 991303841 - 2¹⁰ = 991302817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 991303795 and 991303804.

It is not an unprimeable number, because it can be changed into a prime (991303801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1958846 + ... + 1959351.

It is an arithmetic number, because the mean of its divisors is an integer number (141055128).

Almost surely, 2^991303841 is an apocalyptic number.

It is an amenable number.

991303841 is a deficient number, since it is larger than the sum of its proper divisors (137137183).

991303841 is a wasteful number, since it uses less digits than its factorization.

991303841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3918231.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 991303841 is about 31484.9780212723. The cubic root of 991303841 is about 997.0928369263.

The spelling of 991303841 in words is "nine hundred ninety-one million, three hundred three thousand, eight hundred forty-one".