2281861 has 2 divisors, whose sum is σ = 2281862. Its totient is φ = 2281860.

The previous prime is 2281831. The next prime is 2281883. The reversal of 2281861 is 1681822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 164836 = 1455^2 + 406^2 .

It is a cyclic number.

It is not a de Polignac number, because 2281861 - 2¹¹ = 2279813 is a prime.

It is a Chen prime.

2281861 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2281831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1140930 + 1140931.

It is an arithmetic number, because the mean of its divisors is an integer number (1140931).

2^2281861 is an apocalyptic number.

It is an amenable number.

2281861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2281861 is an equidigital number, since it uses as much as digits as its factorization.

2281861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 28.

The square root of 2281861 is about 1510.5830000367. The cubic root of 2281861 is about 131.6526873656.

The spelling of 2281861 in words is "two million, two hundred eighty-one thousand, eight hundred sixty-one".