6875621 has 2 divisors, whose sum is σ = 6875622. Its totient is φ = 6875620.

The previous prime is 6875593. The next prime is 6875623. The reversal of 6875621 is 1265786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 474721 = 2530^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 6875621 - 2¹⁰ = 6874597 is a prime.

Together with 6875623, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₄₆₈₇₂₈ and since 6875621 and 468728 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6875623) 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, 3437810 + 3437811.

It is an arithmetic number, because the mean of its divisors is an integer number (3437811).

Almost surely, 2^6875621 is an apocalyptic number.

It is an amenable number.

6875621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6875621 is an equidigital number, since it uses as much as digits as its factorization.

6875621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 6875621 is about 2622.1405378049. The cubic root of 6875621 is about 190.1533480378.

The spelling of 6875621 in words is "six million, eight hundred seventy-five thousand, six hundred twenty-one".