489731639 has 2 divisors, whose sum is σ = 489731640. Its totient is φ = 489731638.

The previous prime is 489731629. The next prime is 489731647. The reversal of 489731639 is 936137984.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 489731639 - 2⁸ = 489731383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (489731629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244865819 + 244865820.

It is an arithmetic number, because the mean of its divisors is an integer number (244865820).

Almost surely, 2^489731639 is an apocalyptic number.

489731639 is a deficient number, since it is larger than the sum of its proper divisors (1).

489731639 is an equidigital number, since it uses as much as digits as its factorization.

489731639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 50.

The square root of 489731639 is about 22129.8811338877. The cubic root of 489731639 is about 788.2295657387.

The spelling of 489731639 in words is "four hundred eighty-nine million, seven hundred thirty-one thousand, six hundred thirty-nine".