491743999 has 4 divisors (see below), whose sum is σ = 492317320. Its totient is φ = 491170680.

The previous prime is 491743963. The next prime is 491744003. The reversal of 491743999 is 999347194.

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 491743999 - 2¹³ = 491735807 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 (491743909) 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, 285372 + ... + 287089.

It is an arithmetic number, because the mean of its divisors is an integer number (123079330).

Almost surely, 2^491743999 is an apocalyptic number.

491743999 is a deficient number, since it is larger than the sum of its proper divisors (573321).

491743999 is an equidigital number, since it uses as much as digits as its factorization.

491743999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573320.

The product of its digits is 2204496, while the sum is 55.

The square root of 491743999 is about 22175.3015537557. The cubic root of 491743999 is about 789.3077303527.

The spelling of 491743999 in words is "four hundred ninety-one million, seven hundred forty-three thousand, nine hundred ninety-nine".