491655 has 16 divisors (see below), whose sum is σ = 799200. Its totient is φ = 258048.

The previous prime is 491653. The next prime is 491669. The reversal of 491655 is 556194.

491655 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 491655 - 2¹ = 491653 is a prime.

491655 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491655.

It is not an unprimeable number, because it can be changed into a prime (491651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (49950).

2⁴⁹¹⁶⁵⁵ is an apocalyptic number.

491655 is a deficient number, since it is larger than the sum of its proper divisors (307545).

491655 is a wasteful number, since it uses less digits than its factorization.

491655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its digits is 5400, while the sum is 30.

The square root of 491655 is about 701.1811463524. The cubic root of 491655 is about 78.9260109479.

The spelling of 491655 in words is "four hundred ninety-one thousand, six hundred fifty-five".