6621239 has 2 divisors, whose sum is σ = 6621240. Its totient is φ = 6621238.

The previous prime is 6621233. The next prime is 6621281. The reversal of 6621239 is 9321266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6621239 - 2²⁰ = 5572663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6621233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310619 + 3310620.

It is an arithmetic number, because the mean of its divisors is an integer number (3310620).

Almost surely, 2^6621239 is an apocalyptic number.

6621239 is a deficient number, since it is larger than the sum of its proper divisors (1).

6621239 is an equidigital number, since it uses as much as digits as its factorization.

6621239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 6621239 is about 2573.1768303014. The cubic root of 6621239 is about 187.7787403779.

The spelling of 6621239 in words is "six million, six hundred twenty-one thousand, two hundred thirty-nine".