6523481221 has 2 divisors, whose sum is σ = 6523481222. Its totient is φ = 6523481220.

The previous prime is 6523481219. The next prime is 6523481291. The reversal of 6523481221 is 1221843256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3523728321 + 2999752900 = 59361^2 + 54770^2 .

It is a cyclic number.

It is not a de Polignac number, because 6523481221 - 2¹ = 6523481219 is a prime.

Together with 6523481219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6523481291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3261740610 + 3261740611.

It is an arithmetic number, because the mean of its divisors is an integer number (3261740611).

Almost surely, 2^6523481221 is an apocalyptic number.

It is an amenable number.

6523481221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6523481221 is an equidigital number, since it uses as much as digits as its factorization.

6523481221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 34.

The square root of 6523481221 is about 80768.0705539014. The cubic root of 6523481221 is about 1868.5001577138.

The spelling of 6523481221 in words is "six billion, five hundred twenty-three million, four hundred eighty-one thousand, two hundred twenty-one".