491682163 has 4 divisors (see below), whose sum is σ = 561922480. Its totient is φ = 421441848.

The previous prime is 491682137. The next prime is 491682173. The reversal of 491682163 is 361286194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 361286194 = 2 ⋅180643097.

It is a cyclic number.

It is not a de Polignac number, because 491682163 - 2⁵ = 491682131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (491682173) 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, 35120148 + ... + 35120161.

It is an arithmetic number, because the mean of its divisors is an integer number (140480620).

Almost surely, 2^491682163 is an apocalyptic number.

491682163 is a deficient number, since it is larger than the sum of its proper divisors (70240317).

491682163 is an equidigital number, since it uses as much as digits as its factorization.

491682163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70240316.

The product of its digits is 62208, while the sum is 40.

The square root of 491682163 is about 22173.9072560521. The cubic root of 491682163 is about 789.2746442491.

The spelling of 491682163 in words is "four hundred ninety-one million, six hundred eighty-two thousand, one hundred sixty-three".