6751021 has 2 divisors, whose sum is σ = 6751022. Its totient is φ = 6751020.

The previous prime is 6751009. The next prime is 6751027. The reversal of 6751021 is 1201576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5225796 + 1525225 = 2286^2 + 1235^2 .

It is a cyclic number.

It is not a de Polignac number, because 6751021 - 2¹⁵ = 6718253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6750983 and 6751001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6751027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3375510 + 3375511.

It is an arithmetic number, because the mean of its divisors is an integer number (3375511).

Almost surely, 2^6751021 is an apocalyptic number.

It is an amenable number.

6751021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6751021 is an equidigital number, since it uses as much as digits as its factorization.

6751021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 6751021 is about 2598.2726954652. The cubic root of 6751021 is about 188.9976857401.

Adding to 6751021 its reverse (1201576), we get a palindrome (7952597).

The spelling of 6751021 in words is "six million, seven hundred fifty-one thousand, twenty-one".