491065939 has 36 divisors (see below), whose sum is σ = 638126608. Its totient is φ = 367963200.

The previous prime is 491065937. The next prime is 491065957. The reversal of 491065939 is 939560194.

It is not a de Polignac number, because 491065939 - 2¹ = 491065937 is a prime.

It is a super-2 number, since 2×491065939² = 482291512891903442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491065933) 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 in 35 ways as a sum of consecutive naturals, for example, 4861989 + ... + 4862089.

Almost surely, 2^491065939 is an apocalyptic number.

491065939 is a deficient number, since it is larger than the sum of its proper divisors (147060669).

491065939 is a wasteful number, since it uses less digits than its factorization.

491065939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 491065939 is about 22160.0076489156. The cubic root of 491065939 is about 788.9447744366.

The spelling of 491065939 in words is "four hundred ninety-one million, sixty-five thousand, nine hundred thirty-nine".