491240565 has 32 divisors (see below), whose sum is σ = 884390400. Its totient is φ = 258672960.

The previous prime is 491240543. The next prime is 491240587. The reversal of 491240565 is 565042194.

491240565 is a `hidden beast` number, since 4 + 91 + 2 + 4 + 0 + 565 = 666.

It is an interprime number because it is at equal distance from previous prime (491240543) and next prime (491240587).

It is not a de Polignac number, because 491240565 - 2¹⁸ = 490978421 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12366 + ... + 33695.

It is an arithmetic number, because the mean of its divisors is an integer number (27637200).

Almost surely, 2^491240565 is an apocalyptic number.

491240565 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491240565 is a deficient number, since it is larger than the sum of its proper divisors (393149835).

491240565 is a wasteful number, since it uses less digits than its factorization.

491240565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46154 (or 46148 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 491240565 is about 22163.9474146642. The cubic root of 491240565 is about 789.0382811885.

The spelling of 491240565 in words is "four hundred ninety-one million, two hundred forty thousand, five hundred sixty-five".