491545871 has 8 divisors (see below), whose sum is σ = 520654464. Its totient is φ = 462458880.

The previous prime is 491545849. The next prime is 491545877. The reversal of 491545871 is 178545194.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491545871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491545877) 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, 81986 + ... + 87776.

It is an arithmetic number, because the mean of its divisors is an integer number (65081808).

Almost surely, 2^491545871 is an apocalyptic number.

491545871 is a deficient number, since it is larger than the sum of its proper divisors (29108593).

491545871 is a wasteful number, since it uses less digits than its factorization.

491545871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10801.

The product of its digits is 201600, while the sum is 44.

The square root of 491545871 is about 22170.8337912673. The cubic root of 491545871 is about 789.2017097608.

The spelling of 491545871 in words is "four hundred ninety-one million, five hundred forty-five thousand, eight hundred seventy-one".