491133287 has 8 divisors (see below), whose sum is σ = 503059200. Its totient is φ = 479327544.

The previous prime is 491133277. The next prime is 491133319. The reversal of 491133287 is 782331194.

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 491133287 - 2⁴ = 491133271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491133287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491133277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21743 + ... + 38144.

It is an arithmetic number, because the mean of its divisors is an integer number (62882400).

Almost surely, 2^491133287 is an apocalyptic number.

491133287 is a deficient number, since it is larger than the sum of its proper divisors (11925913).

491133287 is a wasteful number, since it uses less digits than its factorization.

491133287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60085.

The product of its digits is 36288, while the sum is 38.

The square root of 491133287 is about 22161.5271811308. The cubic root of 491133287 is about 788.9808398062.

The spelling of 491133287 in words is "four hundred ninety-one million, one hundred thirty-three thousand, two hundred eighty-seven".