491203679 has 2 divisors, whose sum is σ = 491203680. Its totient is φ = 491203678.

The previous prime is 491203667. The next prime is 491203697. The reversal of 491203679 is 976302194.

Together with next prime (491203697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491203679 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491203639) 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, 245601839 + 245601840.

It is an arithmetic number, because the mean of its divisors is an integer number (245601840).

Almost surely, 2^491203679 is an apocalyptic number.

491203679 is a deficient number, since it is larger than the sum of its proper divisors (1).

491203679 is an equidigital number, since it uses as much as digits as its factorization.

491203679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 491203679 is about 22163.1152819273. The cubic root of 491203679 is about 789.0185317374.

The spelling of 491203679 in words is "four hundred ninety-one million, two hundred three thousand, six hundred seventy-nine".