491239966 has 8 divisors (see below), whose sum is σ = 842125680. Its totient is φ = 210531408.

The previous prime is 491239951. The next prime is 491239979. The reversal of 491239966 is 669932194.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17544271 + ... + 17544298.

It is an arithmetic number, because the mean of its divisors is an integer number (105265710).

Almost surely, 2^491239966 is an apocalyptic number.

491239966 is a deficient number, since it is larger than the sum of its proper divisors (350885714).

491239966 is a wasteful number, since it uses less digits than its factorization.

491239966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35088578.

The product of its digits is 629856, while the sum is 49.

The square root of 491239966 is about 22163.9339017242. The cubic root of 491239966 is about 789.0379604806.

The spelling of 491239966 in words is "four hundred ninety-one million, two hundred thirty-nine thousand, nine hundred sixty-six".