491840983 has 2 divisors, whose sum is σ = 491840984. Its totient is φ = 491840982.

The previous prime is 491840977. The next prime is 491841017. The reversal of 491840983 is 389048194.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491840983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491840683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245920491 + 245920492.

It is an arithmetic number, because the mean of its divisors is an integer number (245920492).

Almost surely, 2^491840983 is an apocalyptic number.

491840983 is a deficient number, since it is larger than the sum of its proper divisors (1).

491840983 is an equidigital number, since it uses as much as digits as its factorization.

491840983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 491840983 is about 22177.4882031307. The cubic root of 491840983 is about 789.3596172350.

The spelling of 491840983 in words is "four hundred ninety-one million, eight hundred forty thousand, nine hundred eighty-three".