489639791 has 2 divisors, whose sum is σ = 489639792. Its totient is φ = 489639790.

The previous prime is 489639779. The next prime is 489639793. The reversal of 489639791 is 197936984.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 489639791 - 2¹⁰ = 489638767 is a prime.

Together with 489639793, 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 (489639793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244819895 + 244819896.

It is an arithmetic number, because the mean of its divisors is an integer number (244819896).

Almost surely, 2^489639791 is an apocalyptic number.

489639791 is a deficient number, since it is larger than the sum of its proper divisors (1).

489639791 is an equidigital number, since it uses as much as digits as its factorization.

489639791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 56.

The square root of 489639791 is about 22127.8058333853. The cubic root of 489639791 is about 788.1802857999.

The spelling of 489639791 in words is "four hundred eighty-nine million, six hundred thirty-nine thousand, seven hundred ninety-one".