2185881 has 4 divisors (see below), whose sum is σ = 2914512. Its totient is φ = 1457252.

The previous prime is 2185873. The next prime is 2185889. The reversal of 2185881 is 1885812.

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 an interprime number because it is at equal distance from previous prime (2185873) and next prime (2185889).

It is a cyclic number.

It is not a de Polignac number, because 2185881 - 2³ = 2185873 is a prime.

It is a super-2 number, since 2×2185881² = 9556151492322, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (2185889) 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, 364311 + ... + 364316.

It is an arithmetic number, because the mean of its divisors is an integer number (728628).

2^2185881 is an apocalyptic number.

It is an amenable number.

2185881 is a deficient number, since it is larger than the sum of its proper divisors (728631).

2185881 is an equidigital number, since it uses as much as digits as its factorization.

2185881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728630.

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

The square root of 2185881 is about 1478.4725225719. The cubic root of 2185881 is about 129.7803193167.

The spelling of 2185881 in words is "two million, one hundred eighty-five thousand, eight hundred eighty-one".