491565065 has 4 divisors (see below), whose sum is σ = 589878084. Its totient is φ = 393252048.

The previous prime is 491565037. The next prime is 491565071. The reversal of 491565065 is 560565194.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368332864 + 123232201 = 19192^2 + 11101^2 .

It is a cyclic number.

It is not a de Polignac number, because 491565065 - 2¹² = 491560969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49156502 + ... + 49156511.

It is an arithmetic number, because the mean of its divisors is an integer number (147469521).

Almost surely, 2^491565065 is an apocalyptic number.

It is an amenable number.

491565065 is a deficient number, since it is larger than the sum of its proper divisors (98313019).

491565065 is an equidigital number, since it uses as much as digits as its factorization.

491565065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98313018.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 491565065 is about 22171.2666530354. The cubic root of 491565065 is about 789.2119819391.

The spelling of 491565065 in words is "four hundred ninety-one million, five hundred sixty-five thousand, sixty-five".