489791 has 2 divisors, whose sum is σ = 489792. Its totient is φ = 489790.

The previous prime is 489761. The next prime is 489793. The reversal of 489791 is 197984.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-489791 is a prime.

Together with 489793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244895 + 244896.

It is an arithmetic number, because the mean of its divisors is an integer number (244896).

2⁴⁸⁹⁷⁹¹ is an apocalyptic number.

489791 is a deficient number, since it is larger than the sum of its proper divisors (1).

489791 is an equidigital number, since it uses as much as digits as its factorization.

489791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 38.

The square root of 489791 is about 699.8506983636. The cubic root of 489791 is about 78.8261411891.

The spelling of 489791 in words is "four hundred eighty-nine thousand, seven hundred ninety-one".