2188581 has 4 divisors (see below), whose sum is σ = 2918112. Its totient is φ = 1459052.

The previous prime is 2188541. The next prime is 2188583. The reversal of 2188581 is 1858812.

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 2188581 - 2¹¹ = 2186533 is a prime.

It is a super-2 number, since 2×2188581² = 9579773587122, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2188583) 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, 364761 + ... + 364766.

It is an arithmetic number, because the mean of its divisors is an integer number (729528).

2^2188581 is an apocalyptic number.

It is an amenable number.

2188581 is a deficient number, since it is larger than the sum of its proper divisors (729531).

2188581 is an equidigital number, since it uses as much as digits as its factorization.

2188581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729530.

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

The square root of 2188581 is about 1479.3853453377. The cubic root of 2188581 is about 129.8337322102.

The spelling of 2188581 in words is "two million, one hundred eighty-eight thousand, five hundred eighty-one".