491582879 has 2 divisors, whose sum is σ = 491582880. Its totient is φ = 491582878.

The previous prime is 491582873. The next prime is 491582881. The reversal of 491582879 is 978285194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491582879 is a prime.

It is a Sophie Germain prime.

Together with 491582881, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 491582879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491582873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245791439 + 245791440.

It is an arithmetic number, because the mean of its divisors is an integer number (245791440).

Almost surely, 2^491582879 is an apocalyptic number.

491582879 is a deficient number, since it is larger than the sum of its proper divisors (1).

491582879 is an equidigital number, since it uses as much as digits as its factorization.

491582879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 491582879 is about 22171.6683855771. The cubic root of 491582879 is about 789.2215153345.

The spelling of 491582879 in words is "four hundred ninety-one million, five hundred eighty-two thousand, eight hundred seventy-nine".