6521715131 has 2 divisors, whose sum is σ = 6521715132. Its totient is φ = 6521715130.

The previous prime is 6521715119. The next prime is 6521715133. The reversal of 6521715131 is 1315171256.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6521715131 is a prime.

It is a super-2 number, since 2×6521715131² = 85065536499828694322, which contains 22 as substring.

Together with 6521715133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6521715133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260857565 + 3260857566.

It is an arithmetic number, because the mean of its divisors is an integer number (3260857566).

Almost surely, 2^6521715131 is an apocalyptic number.

6521715131 is a deficient number, since it is larger than the sum of its proper divisors (1).

6521715131 is an equidigital number, since it uses as much as digits as its factorization.

6521715131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 32.

The square root of 6521715131 is about 80757.1367186826. The cubic root of 6521715131 is about 1868.3315239648.

Adding to 6521715131 its reverse (1315171256), we get a palindrome (7836886387).

The spelling of 6521715131 in words is "six billion, five hundred twenty-one million, seven hundred fifteen thousand, one hundred thirty-one".