491889743 has 4 divisors (see below), whose sum is σ = 491972208. Its totient is φ = 491807280.

The previous prime is 491889731. The next prime is 491889773. The reversal of 491889743 is 347988194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491889743 - 2⁸ = 491889487 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 (491889773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31523 + ... + 44468.

It is an arithmetic number, because the mean of its divisors is an integer number (122993052).

Almost surely, 2^491889743 is an apocalyptic number.

491889743 is a deficient number, since it is larger than the sum of its proper divisors (82465).

491889743 is an equidigital number, since it uses as much as digits as its factorization.

491889743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82464.

The product of its digits is 1741824, while the sum is 53.

The square root of 491889743 is about 22178.5874888371. The cubic root of 491889743 is about 789.3857014807.

The spelling of 491889743 in words is "four hundred ninety-one million, eight hundred eighty-nine thousand, seven hundred forty-three".