491917163173 has 8 divisors (see below), whose sum is σ = 496793468160. Its totient is φ = 487047463920.

The previous prime is 491917163141. The next prime is 491917163201. The reversal of 491917163173 is 371361719194.

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 491917163173 - 2⁵ = 491917163141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491917163173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491917160173) 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, 1501693 + ... + 1799698.

It is an arithmetic number, because the mean of its divisors is an integer number (62099183520).

Almost surely, 2^491917163173 is an apocalyptic number.

It is an amenable number.

491917163173 is a deficient number, since it is larger than the sum of its proper divisors (4876304987).

491917163173 is a wasteful number, since it uses less digits than its factorization.

491917163173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302867.

The product of its digits is 857304, while the sum is 52.

The spelling of 491917163173 in words is "four hundred ninety-one billion, nine hundred seventeen million, one hundred sixty-three thousand, one hundred seventy-three".