991283611 has 8 divisors (see below), whose sum is σ = 1021729248. Its totient is φ = 961296000.

The previous prime is 991283591. The next prime is 991283669. The reversal of 991283611 is 116382199.

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 991283611 - 2⁷ = 991283483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991283411) 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, 110110 + ... + 118771.

It is an arithmetic number, because the mean of its divisors is an integer number (127716156).

Almost surely, 2^991283611 is an apocalyptic number.

991283611 is a deficient number, since it is larger than the sum of its proper divisors (30445637).

991283611 is a wasteful number, since it uses less digits than its factorization.

991283611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229013.

The product of its digits is 23328, while the sum is 40.

The square root of 991283611 is about 31484.6567553150. The cubic root of 991283611 is about 997.0860541672.

The spelling of 991283611 in words is "nine hundred ninety-one million, two hundred eighty-three thousand, six hundred eleven".