3644221391 has 2 divisors, whose sum is σ = 3644221392. Its totient is φ = 3644221390.

The previous prime is 3644221381. The next prime is 3644221417. The reversal of 3644221391 is 1931224463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3644221391 - 2³⁰ = 2570479567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3644221381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822110695 + 1822110696.

It is an arithmetic number, because the mean of its divisors is an integer number (1822110696).

Almost surely, 2^3644221391 is an apocalyptic number.

3644221391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3644221391 is an equidigital number, since it uses as much as digits as its factorization.

3644221391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 3644221391 is about 60367.3868160615. The cubic root of 3644221391 is about 1538.8687637396.

The spelling of 3644221391 in words is "three billion, six hundred forty-four million, two hundred twenty-one thousand, three hundred ninety-one".