3936561321 has 16 divisors (see below), whose sum is σ = 6543894528. Its totient is φ = 2044966800.

The previous prime is 3936561287. The next prime is 3936561337. The reversal of 3936561321 is 1231656393.

It is not a de Polignac number, because 3936561321 - 2⁷ = 3936561193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3936561321.

It is not an unprimeable number, because it can be changed into a prime (3936561371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8520465 + ... + 8520926.

It is an arithmetic number, because the mean of its divisors is an integer number (408993408).

Almost surely, 2^3936561321 is an apocalyptic number.

It is an amenable number.

3936561321 is a deficient number, since it is larger than the sum of its proper divisors (2607333207).

3936561321 is a wasteful number, since it uses less digits than its factorization.

3936561321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17041412.

The product of its digits is 87480, while the sum is 39.

The square root of 3936561321 is about 62742.0219709247. The cubic root of 3936561321 is about 1578.9644072379.

The spelling of 3936561321 in words is "three billion, nine hundred thirty-six million, five hundred sixty-one thousand, three hundred twenty-one".