5671545721 has 2 divisors, whose sum is σ = 5671545722. Its totient is φ = 5671545720.

The previous prime is 5671545713. The next prime is 5671545739. The reversal of 5671545721 is 1275451765.

5671545721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5003581696 + 667964025 = 70736^2 + 25845^2 .

It is a cyclic number.

It is not a de Polignac number, because 5671545721 - 2³ = 5671545713 is a prime.

It is not a weakly prime, because it can be changed into another prime (5671545751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2835772860 + 2835772861.

It is an arithmetic number, because the mean of its divisors is an integer number (2835772861).

Almost surely, 2^5671545721 is an apocalyptic number.

It is an amenable number.

5671545721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5671545721 is an equidigital number, since it uses as much as digits as its factorization.

5671545721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294000, while the sum is 43.

The square root of 5671545721 is about 75309.6655217642. The cubic root of 5671545721 is about 1783.3386107005.

The spelling of 5671545721 in words is "five billion, six hundred seventy-one million, five hundred forty-five thousand, seven hundred twenty-one".