991294811 has 8 divisors (see below), whose sum is σ = 1069783680. Its totient is φ = 913125312.

The previous prime is 991294807. The next prime is 991294823. The reversal of 991294811 is 118492199.

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 991294811 - 2² = 991294807 is a prime.

It is a super-3 number, since 3×991294811³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991294891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73370 + ... + 85823.

It is an arithmetic number, because the mean of its divisors is an integer number (133722960).

Almost surely, 2^991294811 is an apocalyptic number.

991294811 is a deficient number, since it is larger than the sum of its proper divisors (78488869).

991294811 is a wasteful number, since it uses less digits than its factorization.

991294811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159685.

The product of its digits is 46656, while the sum is 44.

The square root of 991294811 is about 31484.8346192258. The cubic root of 991294811 is about 997.0898093393.

The spelling of 991294811 in words is "nine hundred ninety-one million, two hundred ninety-four thousand, eight hundred eleven".