489913691 has 2 divisors, whose sum is σ = 489913692. Its totient is φ = 489913690.

The previous prime is 489913643. The next prime is 489913693. The reversal of 489913691 is 196319984.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-489913691 is a prime.

It is a Sophie Germain prime.

Together with 489913693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (489913693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244956845 + 244956846.

It is an arithmetic number, because the mean of its divisors is an integer number (244956846).

Almost surely, 2^489913691 is an apocalyptic number.

489913691 is a deficient number, since it is larger than the sum of its proper divisors (1).

489913691 is an equidigital number, since it uses as much as digits as its factorization.

489913691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 50.

The square root of 489913691 is about 22133.9940137337. The cubic root of 489913691 is about 788.3272253409.

The spelling of 489913691 in words is "four hundred eighty-nine million, nine hundred thirteen thousand, six hundred ninety-one".