491533 has 16 divisors (see below), whose sum is σ = 608256. Its totient is φ = 388080.

The previous prime is 491531. The next prime is 491537. The reversal of 491533 is 335194.

491533 = 87² + 88² + ... + 128².

491533 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 491533 - 2¹ = 491531 is a prime.

It is a d-powerful number, because it can be written as 4³ + 9⁵ + 5⁷ + 1 + 3¹¹ + 3¹¹ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491498 and 491507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6888 + ... + 6958.

It is an arithmetic number, because the mean of its divisors is an integer number (38016).

2⁴⁹¹⁵³³ is an apocalyptic number.

491533 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

491533 is a deficient number, since it is larger than the sum of its proper divisors (116723).

491533 is a wasteful number, since it uses less digits than its factorization.

491533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144.

The product of its digits is 1620, while the sum is 25.

The square root of 491533 is about 701.0941448907. The cubic root of 491533 is about 78.9194821354.

It can be divided in two parts, 491 and 533, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 491533 in words is "four hundred ninety-one thousand, five hundred thirty-three".