6623549 has 2 divisors, whose sum is σ = 6623550. Its totient is φ = 6623548.

The previous prime is 6623531. The next prime is 6623581. The reversal of 6623549 is 9453266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5428900 + 1194649 = 2330^2 + 1093^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6623549 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 (6683549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311774 + 3311775.

It is an arithmetic number, because the mean of its divisors is an integer number (3311775).

Almost surely, 2^6623549 is an apocalyptic number.

It is an amenable number.

6623549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6623549 is an equidigital number, since it uses as much as digits as its factorization.

6623549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 35.

The square root of 6623549 is about 2573.6256526542. The cubic root of 6623549 is about 187.8005750857.

The spelling of 6623549 in words is "six million, six hundred twenty-three thousand, five hundred forty-nine".