6521641 has 8 divisors (see below), whose sum is σ = 7479360. Its totient is φ = 5570448.

The previous prime is 6521587. The next prime is 6521677. The reversal of 6521641 is 1461256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6521641 - 2⁷ = 6521513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6521041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750 + ... + 3688.

It is an arithmetic number, because the mean of its divisors is an integer number (934920).

Almost surely, 2^6521641 is an apocalyptic number.

It is an amenable number.

6521641 is a deficient number, since it is larger than the sum of its proper divisors (957719).

6521641 is a wasteful number, since it uses less digits than its factorization.

6521641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263.

The product of its digits is 1440, while the sum is 25.

The square root of 6521641 is about 2553.7503793441. The cubic root of 6521641 is about 186.8324444957.

Adding to 6521641 its reverse (1461256), we get a palindrome (7982897).

The spelling of 6521641 in words is "six million, five hundred twenty-one thousand, six hundred forty-one".