2288861 has 2 divisors, whose sum is σ = 2288862. Its totient is φ = 2288860.

The previous prime is 2288849. The next prime is 2288879. The reversal of 2288861 is 1688822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1196836 + 1092025 = 1094^2 + 1045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2288861 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2288801) 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 as a sum of consecutive naturals, namely, 1144430 + 1144431.

It is an arithmetic number, because the mean of its divisors is an integer number (1144431).

2^2288861 is an apocalyptic number.

It is an amenable number.

2288861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2288861 is an equidigital number, since it uses as much as digits as its factorization.

2288861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 35.

The square root of 2288861 is about 1512.8982120420. The cubic root of 2288861 is about 131.7871723404.

The spelling of 2288861 in words is "two million, two hundred eighty-eight thousand, eight hundred sixty-one".