491039491 has 2 divisors, whose sum is σ = 491039492. Its totient is φ = 491039490.

The previous prime is 491039429. The next prime is 491039501. The reversal of 491039491 is 194930194.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491039491 is a prime.

It is a super-2 number, since 2×491039491² = 482239563443078162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491039291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245519745 + 245519746.

It is an arithmetic number, because the mean of its divisors is an integer number (245519746).

Almost surely, 2^491039491 is an apocalyptic number.

491039491 is a deficient number, since it is larger than the sum of its proper divisors (1).

491039491 is an equidigital number, since it uses as much as digits as its factorization.

491039491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 491039491 is about 22159.4108901839. The cubic root of 491039491 is about 788.9306104284.

The spelling of 491039491 in words is "four hundred ninety-one million, thirty-nine thousand, four hundred ninety-one".