2815881 has 8 divisors (see below), whose sum is σ = 3766560. Its totient is φ = 1871232.

The previous prime is 2815877. The next prime is 2815889. The reversal of 2815881 is 1885182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2815881 - 2² = 2815877 is a prime.

It is a super-2 number, since 2×2815881² = 15858371612322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2815889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271 + ... + 2388.

It is an arithmetic number, because the mean of its divisors is an integer number (470820).

2^2815881 is an apocalyptic number.

It is an amenable number.

2815881 is a deficient number, since it is larger than the sum of its proper divisors (950679).

2815881 is a wasteful number, since it uses less digits than its factorization.

2815881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3015.

The product of its digits is 5120, while the sum is 33.

The square root of 2815881 is about 1678.0586998076. The cubic root of 2815881 is about 141.2119442210.

It can be divided in two parts, 281 and 5881, that multiplied together give a palindrome (1652561).

The spelling of 2815881 in words is "two million, eight hundred fifteen thousand, eight hundred eighty-one".