3855812881 has 4 divisors (see below), whose sum is σ = 3945482992. Its totient is φ = 3766142772.

The previous prime is 3855812869. The next prime is 3855812887. The reversal of 3855812881 is 1882185583.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1882185583 = 17 ⋅110716799.

It is a cyclic number.

It is not a de Polignac number, because 3855812881 - 2²⁷ = 3721595153 is a prime.

It is a super-2 number, since 2×3855812881² = 29734585946571040322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3855812887) 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, 44834991 + ... + 44835076.

It is an arithmetic number, because the mean of its divisors is an integer number (986370748).

Almost surely, 2^3855812881 is an apocalyptic number.

It is an amenable number.

3855812881 is a deficient number, since it is larger than the sum of its proper divisors (89670111).

3855812881 is an equidigital number, since it uses as much as digits as its factorization.

3855812881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89670110.

The product of its digits is 614400, while the sum is 49.

The square root of 3855812881 is about 62095.1920924640. The cubic root of 3855812881 is about 1568.0936035474.

The spelling of 3855812881 in words is "three billion, eight hundred fifty-five million, eight hundred twelve thousand, eight hundred eighty-one".