491749 has 4 divisors (see below), whose sum is σ = 493164. Its totient is φ = 490336.

The previous prime is 491747. The next prime is 491773. The reversal of 491749 is 947194.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 947194 = 2 ⋅473597.

It can be written as a sum of positive squares in 2 ways, for example, as 101124 + 390625 = 318^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 491749 - 2¹ = 491747 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 (491747) 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, 219 + ... + 1015.

It is an arithmetic number, because the mean of its divisors is an integer number (123291).

2⁴⁹¹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

491749 is a deficient number, since it is larger than the sum of its proper divisors (1415).

491749 is an equidigital number, since it uses as much as digits as its factorization.

491749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414.

The product of its digits is 9072, while the sum is 34.

The square root of 491749 is about 701.2481729031. The cubic root of 491749 is about 78.9310406077.

The spelling of 491749 in words is "four hundred ninety-one thousand, seven hundred forty-nine".