491383 has 4 divisors (see below), whose sum is σ = 492880. Its totient is φ = 489888.

The previous prime is 491377. The next prime is 491417. The reversal of 491383 is 383194.

491383 is nontrivially palindromic in base 16.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491383 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 (491333) 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, 18 + ... + 991.

It is an arithmetic number, because the mean of its divisors is an integer number (123220).

2⁴⁹¹³⁸³ is an apocalyptic number.

491383 is a deficient number, since it is larger than the sum of its proper divisors (1497).

491383 is a wasteful number, since it uses less digits than its factorization.

491383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496.

The product of its digits is 2592, while the sum is 28.

The square root of 491383 is about 700.9871610807. The cubic root of 491383 is about 78.9114534261.

It can be divided in two parts, 49138 and 3, that added together give a triangular number (49141 = T₃₁₃).

The spelling of 491383 in words is "four hundred ninety-one thousand, three hundred eighty-three".