491172886 has 16 divisors (see below), whose sum is σ = 746701200. Its totient is φ = 242288640.

The previous prime is 491172883. The next prime is 491172893. The reversal of 491172886 is 688271194.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491172883) 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, 60390 + ... + 68038.

It is an arithmetic number, because the mean of its divisors is an integer number (46668825).

Almost surely, 2^491172886 is an apocalyptic number.

491172886 is a deficient number, since it is larger than the sum of its proper divisors (255528314).

491172886 is a wasteful number, since it uses less digits than its factorization.

491172886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8079.

The product of its digits is 193536, while the sum is 46.

The square root of 491172886 is about 22162.4205807940. The cubic root of 491172886 is about 789.0020438347.

It can be divided in two parts, 49117 and 2886, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 491172886 in words is "four hundred ninety-one million, one hundred seventy-two thousand, eight hundred eighty-six".