6521244113 has 4 divisors (see below), whose sum is σ = 6557273268. Its totient is φ = 6485214960.

The previous prime is 6521244061. The next prime is 6521244143. The reversal of 6521244113 is 3114421256.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2650911169 + 3870332944 = 51487^2 + 62212^2 .

It is a cyclic number.

It is not a de Polignac number, because 6521244113 - 2¹⁰ = 6521243089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6521244143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18014306 + ... + 18014667.

It is an arithmetic number, because the mean of its divisors is an integer number (1639318317).

Almost surely, 2^6521244113 is an apocalyptic number.

It is an amenable number.

6521244113 is a deficient number, since it is larger than the sum of its proper divisors (36029155).

6521244113 is a wasteful number, since it uses less digits than its factorization.

6521244113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36029154.

The product of its digits is 5760, while the sum is 29.

The square root of 6521244113 is about 80754.2204036421. The cubic root of 6521244113 is about 1868.2865440300.

Adding to 6521244113 its reverse (3114421256), we get a palindrome (9635665369).

The spelling of 6521244113 in words is "six billion, five hundred twenty-one million, two hundred forty-four thousand, one hundred thirteen".