2816881 has 4 divisors (see below), whose sum is σ = 2858992. Its totient is φ = 2774772.

The previous prime is 2816873. The next prime is 2816899. The reversal of 2816881 is 1886182.

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: 1886182 = 2 ⋅943091.

It is a cyclic number.

It is not a de Polignac number, because 2816881 - 2³ = 2816873 is a prime.

It is a super-2 number, since 2×2816881² = 15869637136322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2816831) 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, 20955 + ... + 21088.

It is an arithmetic number, because the mean of its divisors is an integer number (714748).

2^2816881 is an apocalyptic number.

It is an amenable number.

2816881 is a deficient number, since it is larger than the sum of its proper divisors (42111).

2816881 is an equidigital number, since it uses as much as digits as its factorization.

2816881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42110.

The product of its digits is 6144, while the sum is 34.

The square root of 2816881 is about 1678.3566367134. The cubic root of 2816881 is about 141.2286583780.

It can be divided in two parts, 281 and 6881, that multiplied together give a triangular number (1933561 = T₁₉₆₆).

The spelling of 2816881 in words is "two million, eight hundred sixteen thousand, eight hundred eighty-one".