3869693521 has 4 divisors (see below), whose sum is σ = 3871260772. Its totient is φ = 3868126272.

The previous prime is 3869693519. The next prime is 3869693543. The reversal of 3869693521 is 1253969683.

3869693521 is digitally balanced in base 3, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 2191644225 + 1678049296 = 46815^2 + 40964^2 .

It is a cyclic number.

It is not a de Polignac number, because 3869693521 - 2¹ = 3869693519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3869693551) 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 3 ways as a sum of consecutive naturals, for example, 779916 + ... + 784861.

It is an arithmetic number, because the mean of its divisors is an integer number (967815193).

Almost surely, 2^3869693521 is an apocalyptic number.

It is an amenable number.

3869693521 is a deficient number, since it is larger than the sum of its proper divisors (1567251).

3869693521 is a wasteful number, since it uses less digits than its factorization.

3869693521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567250.

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

The square root of 3869693521 is about 62206.8607229138. The cubic root of 3869693521 is about 1569.9730235943.

The spelling of 3869693521 in words is "three billion, eight hundred sixty-nine million, six hundred ninety-three thousand, five hundred twenty-one".