3881663809 has 3 divisors (see below), whose sum is σ = 3881726113. Its totient is φ = 3881601506.

The previous prime is 3881663789. The next prime is 3881663831. The reversal of 3881663809 is 9083661883.

The square root of 3881663809 is 62303.

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.

It is not a de Polignac number, because 3881663809 - 2⁹ = 3881663297 is a prime.

It is a super-2 number, since 2×3881663809² = 30134627852200776962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3881663899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31152 + ... + 93454.

Almost surely, 2^3881663809 is an apocalyptic number.

3881663809 is the 62303-rd square number.

3881663809 is the 31152-nd centered octagonal number.

It is an amenable number.

3881663809 is a deficient number, since it is larger than the sum of its proper divisors (62304).

3881663809 is an frugal number, since it uses more digits than its factorization.

3881663809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124606 (or 62303 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 52.

The cubic root of 3881663809 is about 1571.5901787700.

The spelling of 3881663809 in words is "three billion, eight hundred eighty-one million, six hundred sixty-three thousand, eight hundred nine".