2188261 has 2 divisors, whose sum is σ = 2188262. Its totient is φ = 2188260.

The previous prime is 2188237. The next prime is 2188267. The reversal of 2188261 is 1628812.

2188261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1943236 + 245025 = 1394^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188261 - 2¹⁹ = 1663973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2188267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094130 + 1094131.

It is an arithmetic number, because the mean of its divisors is an integer number (1094131).

2^2188261 is an apocalyptic number.

It is an amenable number.

2188261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188261 is an equidigital number, since it uses as much as digits as its factorization.

2188261 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 2188261 is about 1479.2771883592. The cubic root of 2188261 is about 129.8274040887.

The spelling of 2188261 in words is "two million, one hundred eighty-eight thousand, two hundred sixty-one".