2177281 has 2 divisors, whose sum is σ = 2177282. Its totient is φ = 2177280.

The previous prime is 2177243. The next prime is 2177297. The reversal of 2177281 is 1827712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2005056 + 172225 = 1416^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 2177281 - 2¹¹ = 2175233 is a prime.

It is a super-2 number, since 2×2177281² = 9481105105922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2177881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1088640 + 1088641.

It is an arithmetic number, because the mean of its divisors is an integer number (1088641).

2^2177281 is an apocalyptic number.

It is an amenable number.

2177281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2177281 is an equidigital number, since it uses as much as digits as its factorization.

2177281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 28.

The square root of 2177281 is about 1475.5612491523. The cubic root of 2177281 is about 129.6098956334.

The spelling of 2177281 in words is "two million, one hundred seventy-seven thousand, two hundred eighty-one".