491440365 has 80 divisors (see below), whose sum is σ = 979646976. Its totient is φ = 234057600.

The previous prime is 491440357. The next prime is 491440451. The reversal of 491440365 is 563044194.

It is not a de Polignac number, because 491440365 - 2³ = 491440357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 161710 + ... + 164720.

Almost surely, 2^491440365 is an apocalyptic number.

491440365 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

491440365 is a deficient number, since it is larger than the sum of its proper divisors (488206611).

491440365 is a wasteful number, since it uses less digits than its factorization.

491440365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072 (or 3063 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 491440365 is about 22168.4542762909. The cubic root of 491440365 is about 789.1452406507.

The spelling of 491440365 in words is "four hundred ninety-one million, four hundred forty thousand, three hundred sixty-five".