4056521549 has 2 divisors, whose sum is σ = 4056521550. Its totient is φ = 4056521548.

The previous prime is 4056521507. The next prime is 4056521551. The reversal of 4056521549 is 9451256504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2960448100 + 1096073449 = 54410^2 + 33107^2 .

It is a cyclic number.

It is not a de Polignac number, because 4056521549 - 2¹² = 4056517453 is a prime.

Together with 4056521551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4056521849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2028260774 + 2028260775.

It is an arithmetic number, because the mean of its divisors is an integer number (2028260775).

Almost surely, 2^4056521549 is an apocalyptic number.

It is an amenable number.

4056521549 is a deficient number, since it is larger than the sum of its proper divisors (1).

4056521549 is an equidigital number, since it uses as much as digits as its factorization.

4056521549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 4056521549 is about 63690.8278247347. The cubic root of 4056521549 is about 1594.8429727194.

The spelling of 4056521549 in words is "four billion, fifty-six million, five hundred twenty-one thousand, five hundred forty-nine".