6559639 has 2 divisors, whose sum is σ = 6559640. Its totient is φ = 6559638.

The previous prime is 6559633. The next prime is 6559643. The reversal of 6559639 is 9369556.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6559639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6559595 and 6559604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6559633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3279819 + 3279820.

It is an arithmetic number, because the mean of its divisors is an integer number (3279820).

Almost surely, 2^6559639 is an apocalyptic number.

6559639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6559639 is an equidigital number, since it uses as much as digits as its factorization.

6559639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 218700, while the sum is 43.

The square root of 6559639 is about 2561.1792205935. The cubic root of 6559639 is about 187.1945985335.

The spelling of 6559639 in words is "six million, five hundred fifty-nine thousand, six hundred thirty-nine".