991326899 has 8 divisors (see below), whose sum is σ = 1059832800. Its totient is φ = 923953536.

The previous prime is 991326857. The next prime is 991326901. The reversal of 991326899 is 998623199.

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

It is a de Polignac number, because none of the positive numbers 2^k-991326899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991326199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281324 + ... + 284825.

It is an arithmetic number, because the mean of its divisors is an integer number (132479100).

Almost surely, 2^991326899 is an apocalyptic number.

991326899 is a deficient number, since it is larger than the sum of its proper divisors (68505901).

991326899 is a wasteful number, since it uses less digits than its factorization.

991326899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566269.

The product of its digits is 1889568, while the sum is 56.

The square root of 991326899 is about 31485.3441937674. The cubic root of 991326899 is about 997.1005677509.

The spelling of 991326899 in words is "nine hundred ninety-one million, three hundred twenty-six thousand, eight hundred ninety-nine".