6520401 has 24 divisors (see below), whose sum is σ = 10501920. Its totient is φ = 3874176.

The previous prime is 6520387. The next prime is 6520403. The reversal of 6520401 is 1040256.

It is a happy number.

It is not a de Polignac number, because 6520401 - 2²¹ = 4423249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6520403) 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 in 23 ways as a sum of consecutive naturals, for example, 1786 + ... + 4028.

It is an arithmetic number, because the mean of its divisors is an integer number (437580).

Almost surely, 2^6520401 is an apocalyptic number.

It is an amenable number.

6520401 is a deficient number, since it is larger than the sum of its proper divisors (3981519).

6520401 is a wasteful number, since it uses less digits than its factorization.

6520401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285 (or 2282 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 6520401 is about 2553.5075876136. The cubic root of 6520401 is about 186.8206025419.

Adding to 6520401 its reverse (1040256), we get a palindrome (7560657).

The spelling of 6520401 in words is "six million, five hundred twenty thousand, four hundred one".