491559 has 4 divisors (see below), whose sum is σ = 655416. Its totient is φ = 327704.

The previous prime is 491539. The next prime is 491581. The reversal of 491559 is 955194.

491559 is nontrivially palindromic in base 15.

491559 is an esthetic number in base 15, because in such base its adjacent digits differ by 1.

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 491559 - 2⁵ = 491527 is a prime.

It is a D-number.

491559 is an undulating number in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491539) 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, 81924 + ... + 81929.

It is an arithmetic number, because the mean of its divisors is an integer number (163854).

2⁴⁹¹⁵⁵⁹ is an apocalyptic number.

491559 is a deficient number, since it is larger than the sum of its proper divisors (163857).

491559 is a wasteful number, since it uses less digits than its factorization.

491559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163856.

The product of its digits is 8100, while the sum is 33.

The square root of 491559 is about 701.1126870910. The cubic root of 491559 is about 78.9208736122.

The spelling of 491559 in words is "four hundred ninety-one thousand, five hundred fifty-nine".