3881865081 has 4 divisors (see below), whose sum is σ = 5175820112. Its totient is φ = 2587910052.

The previous prime is 3881865073. The next prime is 3881865083. The reversal of 3881865081 is 1805681883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 3881865081 - 2³ = 3881865073 is a prime.

It is a super-2 number, since 2×3881865081² = 30137753014174273122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3881865081.

It is not an unprimeable number, because it can be changed into a prime (3881865083) 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, 646977511 + ... + 646977516.

It is an arithmetic number, because the mean of its divisors is an integer number (1293955028).

Almost surely, 2^3881865081 is an apocalyptic number.

It is an amenable number.

3881865081 is a deficient number, since it is larger than the sum of its proper divisors (1293955031).

3881865081 is a wasteful number, since it uses less digits than its factorization.

3881865081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293955030.

The product of its (nonzero) digits is 368640, while the sum is 48.

The square root of 3881865081 is about 62304.6152463844. The cubic root of 3881865081 is about 1571.6173416608.

The spelling of 3881865081 in words is "three billion, eight hundred eighty-one million, eight hundred sixty-five thousand, eighty-one".