491636 has 12 divisors (see below), whose sum is σ = 870660. Its totient is φ = 242880.

The previous prime is 491633. The next prime is 491639. The reversal of 491636 is 636194.

It is an interprime number because it is at equal distance from previous prime (491633) and next prime (491639).

It can be written as a sum of positive squares in 2 ways, for example, as 155236 + 336400 = 394^2 + 580^2 .

It is a junction number, because it is equal to n+sod(n) for n = 491599 and 491608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491633) 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, 335 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (72555).

2⁴⁹¹⁶³⁶ is an apocalyptic number.

It is an amenable number.

491636 is a deficient number, since it is larger than the sum of its proper divisors (379024).

491636 is a wasteful number, since it uses less digits than its factorization.

491636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474 (or 1472 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 491636 is about 701.1675976541. The cubic root of 491636 is about 78.9249942366.

The spelling of 491636 in words is "four hundred ninety-one thousand, six hundred thirty-six".