6411521 has 2 divisors, whose sum is σ = 6411522. Its totient is φ = 6411520.

The previous prime is 6411469. The next prime is 6411529. The reversal of 6411521 is 1251146.

6411521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6150400 + 261121 = 2480^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 6411521 - 2¹⁰ = 6410497 is a prime.

It is a super-2 number, since 2×6411521² = 82215203066882, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6411493 and 6411502.

It is not a weakly prime, because it can be changed into another prime (6411529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3205760 + 3205761.

It is an arithmetic number, because the mean of its divisors is an integer number (3205761).

Almost surely, 2^6411521 is an apocalyptic number.

It is an amenable number.

6411521 is a deficient number, since it is larger than the sum of its proper divisors (1).

6411521 is an equidigital number, since it uses as much as digits as its factorization.

6411521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 20.

The square root of 6411521 is about 2532.0981418579. The cubic root of 6411521 is about 185.7748943628.

Adding to 6411521 its reverse (1251146), we get a palindrome (7662667).

The spelling of 6411521 in words is "six million, four hundred eleven thousand, five hundred twenty-one".