6872521 has 2 divisors, whose sum is σ = 6872522. Its totient is φ = 6872520.

The previous prime is 6872513. The next prime is 6872581. The reversal of 6872521 is 1252786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6250000 + 622521 = 2500^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 6872521 - 2³ = 6872513 is a prime.

It is not a weakly prime, because it can be changed into another prime (6872501) 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, 3436260 + 3436261.

It is an arithmetic number, because the mean of its divisors is an integer number (3436261).

Almost surely, 2^6872521 is an apocalyptic number.

It is an amenable number.

6872521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6872521 is an equidigital number, since it uses as much as digits as its factorization.

6872521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 6872521 is about 2621.5493510518. The cubic root of 6872521 is about 190.1247656987.

The spelling of 6872521 in words is "six million, eight hundred seventy-two thousand, five hundred twenty-one".