491807371 has 4 divisors (see below), whose sum is σ = 536517144. Its totient is φ = 447097600.

The previous prime is 491807369. The next prime is 491807443. The reversal of 491807371 is 173708194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491807371 - 2¹ = 491807369 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491807471) 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 3 ways as a sum of consecutive naturals, for example, 22354870 + ... + 22354891.

It is an arithmetic number, because the mean of its divisors is an integer number (134129286).

Almost surely, 2^491807371 is an apocalyptic number.

491807371 is a deficient number, since it is larger than the sum of its proper divisors (44709773).

491807371 is a wasteful number, since it uses less digits than its factorization.

491807371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44709772.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 491807371 is about 22176.7303947178. The cubic root of 491807371 is about 789.3416354341.

The spelling of 491807371 in words is "four hundred ninety-one million, eight hundred seven thousand, three hundred seventy-one".