489791987 has 2 divisors, whose sum is σ = 489791988. Its totient is φ = 489791986.

The previous prime is 489791959. The next prime is 489791989. The reversal of 489791987 is 789197984.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-489791987 is a prime.

Together with 489791989, 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 (489791989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244895993 + 244895994.

It is an arithmetic number, because the mean of its divisors is an integer number (244895994).

Almost surely, 2^489791987 is an apocalyptic number.

489791987 is a deficient number, since it is larger than the sum of its proper divisors (1).

489791987 is an equidigital number, since it uses as much as digits as its factorization.

489791987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 62.

The square root of 489791987 is about 22131.2445876864. The cubic root of 489791987 is about 788.2619413775.

The spelling of 489791987 in words is "four hundred eighty-nine million, seven hundred ninety-one thousand, nine hundred eighty-seven".