491853331 has 2 divisors, whose sum is σ = 491853332. Its totient is φ = 491853330.

The previous prime is 491853293. The next prime is 491853391. The reversal of 491853331 is 133358194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491853331 - 2⁹ = 491852819 is a prime.

It is a super-2 number, since 2×491853331² = 483839398431591122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491853391) 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, 245926665 + 245926666.

It is an arithmetic number, because the mean of its divisors is an integer number (245926666).

Almost surely, 2^491853331 is an apocalyptic number.

491853331 is a deficient number, since it is larger than the sum of its proper divisors (1).

491853331 is an equidigital number, since it uses as much as digits as its factorization.

491853331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 491853331 is about 22177.7665917919. The cubic root of 491853331 is about 789.3662229818.

The spelling of 491853331 in words is "four hundred ninety-one million, eight hundred fifty-three thousand, three hundred thirty-one".