491335571 has 2 divisors, whose sum is σ = 491335572. Its totient is φ = 491335570.

The previous prime is 491335561. The next prime is 491335613. The reversal of 491335571 is 175533194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491335571 - 2¹⁴ = 491319187 is a prime.

It is not a weakly prime, because it can be changed into another prime (491335511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245667785 + 245667786.

It is an arithmetic number, because the mean of its divisors is an integer number (245667786).

Almost surely, 2^491335571 is an apocalyptic number.

491335571 is a deficient number, since it is larger than the sum of its proper divisors (1).

491335571 is an equidigital number, since it uses as much as digits as its factorization.

491335571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 38.

The square root of 491335571 is about 22166.0905664486. The cubic root of 491335571 is about 789.0891446175.

The spelling of 491335571 in words is "four hundred ninety-one million, three hundred thirty-five thousand, five hundred seventy-one".