6651239 has 4 divisors (see below), whose sum is σ = 7601424. Its totient is φ = 5701056.

The previous prime is 6651223. The next prime is 6651251. The reversal of 6651239 is 9321566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9321566 = 2 ⋅4660783.

It is a cyclic number.

It is not a de Polignac number, because 6651239 - 2⁴ = 6651223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475082 + ... + 475095.

It is an arithmetic number, because the mean of its divisors is an integer number (1900356).

Almost surely, 2^6651239 is an apocalyptic number.

6651239 is a deficient number, since it is larger than the sum of its proper divisors (950185).

6651239 is an equidigital number, since it uses as much as digits as its factorization.

6651239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950184.

The product of its digits is 9720, while the sum is 32.

The square root of 6651239 is about 2578.9996122528. Note that the first 3 decimals coincide. The cubic root of 6651239 is about 188.0619137409.

The spelling of 6651239 in words is "six million, six hundred fifty-one thousand, two hundred thirty-nine".