3643479221 has 2 divisors, whose sum is σ = 3643479222. Its totient is φ = 3643479220.

The previous prime is 3643479199. The next prime is 3643479313. The reversal of 3643479221 is 1229743463.

3643479221 is digitally balanced in base 2, 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., 3643450321 + 28900 = 60361^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 3643479221 - 2⁶ = 3643479157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3643475221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821739610 + 1821739611.

It is an arithmetic number, because the mean of its divisors is an integer number (1821739611).

Almost surely, 2^3643479221 is an apocalyptic number.

It is an amenable number.

3643479221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643479221 is an equidigital number, since it uses as much as digits as its factorization.

3643479221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 41.

The square root of 3643479221 is about 60361.2393925108. The cubic root of 3643479221 is about 1538.7642896834.

The spelling of 3643479221 in words is "three billion, six hundred forty-three million, four hundred seventy-nine thousand, two hundred twenty-one".