2861881 has 4 divisors (see below), whose sum is σ = 3122064. Its totient is φ = 2601700.

The previous prime is 2861869. The next prime is 2861897. The reversal of 2861881 is 1881682.

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 2861881 - 2⁵ = 2861849 is a prime.

It is a super-2 number, since 2×2861881² = 16380725716322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2861801) 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 3 ways as a sum of consecutive naturals, for example, 130075 + ... + 130096.

It is an arithmetic number, because the mean of its divisors is an integer number (780516).

2^2861881 is an apocalyptic number.

It is an amenable number.

2861881 is a deficient number, since it is larger than the sum of its proper divisors (260183).

2861881 is a wasteful number, since it uses less digits than its factorization.

2861881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260182.

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

The square root of 2861881 is about 1691.7094904268. The cubic root of 2861881 is about 141.9767369152.

The spelling of 2861881 in words is "two million, eight hundred sixty-one thousand, eight hundred eighty-one".