491172663 has 8 divisors (see below), whose sum is σ = 655003008. Its totient is φ = 327395384.

The previous prime is 491172631. The next prime is 491172679. The reversal of 491172663 is 366271194.

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 491172663 - 2⁵ = 491172631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491172863) 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, 20920 + ... + 37682.

It is an arithmetic number, because the mean of its divisors is an integer number (81875376).

Almost surely, 2^491172663 is an apocalyptic number.

491172663 is a deficient number, since it is larger than the sum of its proper divisors (163830345).

491172663 is a wasteful number, since it uses less digits than its factorization.

491172663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26533.

The product of its digits is 54432, while the sum is 39.

The square root of 491172663 is about 22162.4155497545. The cubic root of 491172663 is about 789.0019244284.

The spelling of 491172663 in words is "four hundred ninety-one million, one hundred seventy-two thousand, six hundred sixty-three".