6821623 has 2 divisors, whose sum is σ = 6821624. Its totient is φ = 6821622.

The previous prime is 6821611. The next prime is 6821629. The reversal of 6821623 is 3261286.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6821623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6821591 and 6821600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6821629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410811 + 3410812.

It is an arithmetic number, because the mean of its divisors is an integer number (3410812).

Almost surely, 2^6821623 is an apocalyptic number.

6821623 is a deficient number, since it is larger than the sum of its proper divisors (1).

6821623 is an equidigital number, since it uses as much as digits as its factorization.

6821623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 6821623 is about 2611.8236923652. The cubic root of 6821623 is about 189.6542465413.

The spelling of 6821623 in words is "six million, eight hundred twenty-one thousand, six hundred twenty-three".