3128881 has 4 divisors (see below), whose sum is σ = 3575872. Its totient is φ = 2681892.

The previous prime is 3128869. The next prime is 3128887. The reversal of 3128881 is 1888213.

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 a cyclic number.

It is not a de Polignac number, because 3128881 - 2⁵ = 3128849 is a prime.

It is a super-2 number, since 2×3128881² = 19579792624322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3128887) 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, 223485 + ... + 223498.

It is an arithmetic number, because the mean of its divisors is an integer number (893968).

Almost surely, 2^3128881 is an apocalyptic number.

It is an amenable number.

3128881 is a deficient number, since it is larger than the sum of its proper divisors (446991).

3128881 is an equidigital number, since it uses as much as digits as its factorization.

3128881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446990.

The product of its digits is 3072, while the sum is 31.

The square root of 3128881 is about 1768.8643249272. The cubic root of 3128881 is about 146.2613851414.

The spelling of 3128881 in words is "three million, one hundred twenty-eight thousand, eight hundred eighty-one".