491816 has 16 divisors (see below), whose sum is σ = 993300. Its totient is φ = 226944.

The previous prime is 491797. The next prime is 491819. The reversal of 491816 is 618194.

It can be written as a sum of positive squares in 2 ways, for example, as 372100 + 119716 = 610^2 + 346^2 .

It is not an unprimeable number, because it can be changed into a prime (491819) by changing a digit.

491816 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 2261 + ... + 2468.

2⁴⁹¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

491816 is an abundant number, since it is smaller than the sum of its proper divisors (501484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491816 is a wasteful number, since it uses less digits than its factorization.

491816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4748 (or 4744 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 491816 is about 701.2959432365. The cubic root of 491816 is about 78.9346251868.

The spelling of 491816 in words is "four hundred ninety-one thousand, eight hundred sixteen".