491469823 has 16 divisors (see below), whose sum is σ = 545126400. Its totient is φ = 440275680.

The previous prime is 491469791. The next prime is 491469889. The reversal of 491469823 is 328964194.

It is not a de Polignac number, because 491469823 - 2⁵ = 491469791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491469623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56538 + ... + 64648.

It is an arithmetic number, because the mean of its divisors is an integer number (34070400).

Almost surely, 2^491469823 is an apocalyptic number.

491469823 is a deficient number, since it is larger than the sum of its proper divisors (53656577).

491469823 is a wasteful number, since it uses less digits than its factorization.

491469823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262.

The product of its digits is 373248, while the sum is 46.

The square root of 491469823 is about 22169.1186789191. The cubic root of 491469823 is about 789.1610080274.

The spelling of 491469823 in words is "four hundred ninety-one million, four hundred sixty-nine thousand, eight hundred twenty-three".