2169281 has 2 divisors, whose sum is σ = 2169282. Its totient is φ = 2169280.

The previous prime is 2169227. The next prime is 2169289. The reversal of 2169281 is 1829612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2016400 + 152881 = 1420^2 + 391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2169281 is a prime.

It is a super-2 number, since 2×2169281² = 9411560113922, 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 (2169289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084640 + 1084641.

It is an arithmetic number, because the mean of its divisors is an integer number (1084641).

2^2169281 is an apocalyptic number.

It is an amenable number.

2169281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2169281 is an equidigital number, since it uses as much as digits as its factorization.

2169281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 2169281 is about 1472.8479215452. The cubic root of 2169281 is about 129.4509586073.

The spelling of 2169281 in words is "two million, one hundred sixty-nine thousand, two hundred eighty-one".