3639821069 has 4 divisors (see below), whose sum is σ = 3666389244. Its totient is φ = 3613252896.

The previous prime is 3639821039. The next prime is 3639821083. The reversal of 3639821069 is 9601289363.

3639821069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9601289363 = 5783 ⋅1660261.

It can be written as a sum of positive squares in 2 ways, for example, as 2914596169 + 725224900 = 53987^2 + 26930^2 .

It is a cyclic number.

It is not a de Polignac number, because 3639821069 - 2⁸ = 3639820813 is a prime.

It is a super-2 number, since 2×3639821069² = 26496594828672605522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639821039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13283882 + ... + 13284155.

It is an arithmetic number, because the mean of its divisors is an integer number (916597311).

Almost surely, 2^3639821069 is an apocalyptic number.

It is an amenable number.

3639821069 is a deficient number, since it is larger than the sum of its proper divisors (26568175).

3639821069 is a wasteful number, since it uses less digits than its factorization.

3639821069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26568174.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 3639821069 is about 60330.9296215465. The cubic root of 3639821069 is about 1538.2491302003.

The spelling of 3639821069 in words is "three billion, six hundred thirty-nine million, eight hundred twenty-one thousand, sixty-nine".