491771806 has 8 divisors (see below), whose sum is σ = 737789544. Its totient is φ = 245841960.

The previous prime is 491771783. The next prime is 491771867. The reversal of 491771806 is 608177194.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5520 + ... + 31843.

It is an arithmetic number, because the mean of its divisors is an integer number (92223693).

Almost surely, 2^491771806 is an apocalyptic number.

491771806 is a deficient number, since it is larger than the sum of its proper divisors (246017738).

491771806 is a wasteful number, since it uses less digits than its factorization.

491771806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43946.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 491771806 is about 22175.9285262196. The cubic root of 491771806 is about 789.3226079221.

The spelling of 491771806 in words is "four hundred ninety-one million, seven hundred seventy-one thousand, eight hundred six".