3634944821 has 2 divisors, whose sum is σ = 3634944822. Its totient is φ = 3634944820.

The previous prime is 3634944793. The next prime is 3634944857. The reversal of 3634944821 is 1284494363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3156866596 + 478078225 = 56186^2 + 21865^2 .

It is a cyclic number.

It is not a de Polignac number, because 3634944821 - 2¹⁰ = 3634943797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3634944721) 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, 1817472410 + 1817472411.

It is an arithmetic number, because the mean of its divisors is an integer number (1817472411).

Almost surely, 2^3634944821 is an apocalyptic number.

It is an amenable number.

3634944821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3634944821 is an equidigital number, since it uses as much as digits as its factorization.

3634944821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 44.

The square root of 3634944821 is about 60290.5035722874. The cubic root of 3634944821 is about 1537.5618952851.

The spelling of 3634944821 in words is "three billion, six hundred thirty-four million, nine hundred forty-four thousand, eight hundred twenty-one".