2188481 has 2 divisors, whose sum is σ = 2188482. Its totient is φ = 2188480.

The previous prime is 2188463. The next prime is 2188489. The reversal of 2188481 is 1848812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1809025 + 379456 = 1345^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188481 - 2¹⁰ = 2187457 is a prime.

It is a super-2 number, since 2×2188481² = 9578898174722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2188489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094240 + 1094241.

It is an arithmetic number, because the mean of its divisors is an integer number (1094241).

2^2188481 is an apocalyptic number.

It is an amenable number.

2188481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2188481 is an equidigital number, since it uses as much as digits as its factorization.

2188481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4096, while the sum is 32.

The square root of 2188481 is about 1479.3515471314. The cubic root of 2188481 is about 129.8317547385.

The spelling of 2188481 in words is "two million, one hundred eighty-eight thousand, four hundred eighty-one".