3639829561 has 3 divisors (see below), whose sum is σ = 3639889893. Its totient is φ = 3639769230.

The previous prime is 3639829549. The next prime is 3639829573. The reversal of 3639829561 is 1659289363.

The square root of 3639829561 is 60331.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1659289363 = 47 ⋅35304029.

It is an interprime number because it is at equal distance from previous prime (3639829549) and next prime (3639829573).

It is not a de Polignac number, because 3639829561 - 2⁷ = 3639829433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3639829499 and 3639829508.

It is not an unprimeable number, because it can be changed into a prime (3639821561) 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 in 2 ways as a sum of consecutive naturals, for example, 30166 + ... + 90496.

It is an arithmetic number, because the mean of its divisors is an integer number (1213296631).

Almost surely, 2^3639829561 is an apocalyptic number.

3639829561 is the 60331-st square number.

3639829561 is the 30166-th centered octagonal number.

It is an amenable number.

3639829561 is a deficient number, since it is larger than the sum of its proper divisors (60332).

3639829561 is an frugal number, since it uses more digits than its factorization.

3639829561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120662 (or 60331 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 52.

The cubic root of 3639829561 is about 1538.2503264864.

The spelling of 3639829561 in words is "three billion, six hundred thirty-nine million, eight hundred twenty-nine thousand, five hundred sixty-one".