491965039 has 2 divisors, whose sum is σ = 491965040. Its totient is φ = 491965038.

The previous prime is 491965037. The next prime is 491965139. The reversal of 491965039 is 930569194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491965039 - 2¹ = 491965037 is a prime.

Together with 491965037, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 491965039.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491965037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245982519 + 245982520.

It is an arithmetic number, because the mean of its divisors is an integer number (245982520).

Almost surely, 2^491965039 is an apocalyptic number.

491965039 is a deficient number, since it is larger than the sum of its proper divisors (1).

491965039 is an equidigital number, since it uses as much as digits as its factorization.

491965039 is an odious number, because the sum of its binary digits is odd.

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

The square root of 491965039 is about 22180.2849170158. The cubic root of 491965039 is about 789.4259778191.

The spelling of 491965039 in words is "four hundred ninety-one million, nine hundred sixty-five thousand, thirty-nine".