491594401 has 2 divisors, whose sum is σ = 491594402. Its totient is φ = 491594400.

The previous prime is 491594377. The next prime is 491594413. The reversal of 491594401 is 104495194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254434401 + 237160000 = 15951^2 + 15400^2 .

It is a cyclic number.

It is not a de Polignac number, because 491594401 - 2⁹ = 491593889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (491592401) 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, 245797200 + 245797201.

It is an arithmetic number, because the mean of its divisors is an integer number (245797201).

Almost surely, 2^491594401 is an apocalyptic number.

It is an amenable number.

491594401 is a deficient number, since it is larger than the sum of its proper divisors (1).

491594401 is an equidigital number, since it uses as much as digits as its factorization.

491594401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 491594401 is about 22171.9282201616. The cubic root of 491594401 is about 789.2276813611.

The spelling of 491594401 in words is "four hundred ninety-one million, five hundred ninety-four thousand, four hundred one".