6999647 has 2 divisors, whose sum is σ = 6999648. Its totient is φ = 6999646.

The previous prime is 6999611. The next prime is 6999661. The reversal of 6999647 is 7469996.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6999647 - 2¹⁰ = 6998623 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6999595 and 6999604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6999547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499823 + 3499824.

It is an arithmetic number, because the mean of its divisors is an integer number (3499824).

Almost surely, 2^6999647 is an apocalyptic number.

6999647 is a deficient number, since it is larger than the sum of its proper divisors (1).

6999647 is an equidigital number, since it uses as much as digits as its factorization.

6999647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 6999647 is about 2645.6845994941. The cubic root of 6999647 is about 191.2899026770.

The spelling of 6999647 in words is "six million, nine hundred ninety-nine thousand, six hundred forty-seven".