6639049 has 2 divisors, whose sum is σ = 6639050. Its totient is φ = 6639048.

The previous prime is 6639047. The next prime is 6639067. The reversal of 6639049 is 9409366.

6639049 is nontrivially palindromic in base 13.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4410000 + 2229049 = 2100^2 + 1493^2 .

It is a cyclic number.

It is not a de Polignac number, because 6639049 - 2¹ = 6639047 is a prime.

Together with 6639047, it forms a pair of twin primes.

6639049 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6638999 and 6639017.

It is not a weakly prime, because it can be changed into another prime (6639041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319524 + 3319525.

It is an arithmetic number, because the mean of its divisors is an integer number (3319525).

Almost surely, 2^6639049 is an apocalyptic number.

It is an amenable number.

6639049 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639049 is an equidigital number, since it uses as much as digits as its factorization.

6639049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 6639049 is about 2576.6352089498. The cubic root of 6639049 is about 187.9469538735.

The spelling of 6639049 in words is "six million, six hundred thirty-nine thousand, forty-nine".