3643505321 has 2 divisors, whose sum is σ = 3643505322. Its totient is φ = 3643505320.

The previous prime is 3643505317. The next prime is 3643505323. The reversal of 3643505321 is 1235053463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1906282921 + 1737222400 = 43661^2 + 41680^2 .

It is a cyclic number.

It is not a de Polignac number, because 3643505321 - 2² = 3643505317 is a prime.

Together with 3643505323, 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 (3643505323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821752660 + 1821752661.

It is an arithmetic number, because the mean of its divisors is an integer number (1821752661).

Almost surely, 2^3643505321 is an apocalyptic number.

It is an amenable number.

3643505321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643505321 is an equidigital number, since it uses as much as digits as its factorization.

3643505321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 3643505321 is about 60361.4555904677. The cubic root of 3643505321 is about 1538.7679639784.

Adding to 3643505321 its reverse (1235053463), we get a palindrome (4878558784).

The spelling of 3643505321 in words is "three billion, six hundred forty-three million, five hundred five thousand, three hundred twenty-one".