3638321389 has 2 divisors, whose sum is σ = 3638321390. Its totient is φ = 3638321388.

The previous prime is 3638321383. The next prime is 3638321399. The reversal of 3638321389 is 9831238363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2835562500 + 802758889 = 53250^2 + 28333^2 .

It is a cyclic number.

It is not a de Polignac number, because 3638321389 - 2¹¹ = 3638319341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3638321383) 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, 1819160694 + 1819160695.

It is an arithmetic number, because the mean of its divisors is an integer number (1819160695).

Almost surely, 2^3638321389 is an apocalyptic number.

It is an amenable number.

3638321389 is a deficient number, since it is larger than the sum of its proper divisors (1).

3638321389 is an equidigital number, since it uses as much as digits as its factorization.

3638321389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 3638321389 is about 60318.4995585931. The cubic root of 3638321389 is about 1538.0378379132.

The spelling of 3638321389 in words is "three billion, six hundred thirty-eight million, three hundred twenty-one thousand, three hundred eighty-nine".