491841577 has 2 divisors, whose sum is σ = 491841578. Its totient is φ = 491841576.

The previous prime is 491841557. The next prime is 491841587. The reversal of 491841577 is 775148194.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490578201 + 1263376 = 22149^2 + 1124^2 .

It is a cyclic number.

It is not a de Polignac number, because 491841577 - 2¹⁵ = 491808809 is a prime.

It is not a weakly prime, because it can be changed into another prime (491841527) 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, 245920788 + 245920789.

It is an arithmetic number, because the mean of its divisors is an integer number (245920789).

Almost surely, 2^491841577 is an apocalyptic number.

It is an amenable number.

491841577 is a deficient number, since it is larger than the sum of its proper divisors (1).

491841577 is an equidigital number, since it uses as much as digits as its factorization.

491841577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 46.

The square root of 491841577 is about 22177.5015950851. The cubic root of 491841577 is about 789.3599350067.

The spelling of 491841577 in words is "four hundred ninety-one million, eight hundred forty-one thousand, five hundred seventy-seven".