491441665 has 16 divisors (see below), whose sum is σ = 692830656. Its totient is φ = 329918400.

The previous prime is 491441641. The next prime is 491441677. The reversal of 491441665 is 566144194.

It is not a de Polignac number, because 491441665 - 2¹⁷ = 491310593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 342951 + ... + 344380.

It is an arithmetic number, because the mean of its divisors is an integer number (43301916).

Almost surely, 2^491441665 is an apocalyptic number.

It is an amenable number.

491441665 is a deficient number, since it is larger than the sum of its proper divisors (201388991).

491441665 is a wasteful number, since it uses less digits than its factorization.

491441665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687360.

The product of its digits is 103680, while the sum is 40.

The square root of 491441665 is about 22168.4835972152. The cubic root of 491441665 is about 789.1459364883.

The spelling of 491441665 in words is "four hundred ninety-one million, four hundred forty-one thousand, six hundred sixty-five".