16611281 has 2 divisors, whose sum is σ = 16611282. Its totient is φ = 16611280.

The previous prime is 16611247. The next prime is 16611299. The reversal of 16611281 is 18211661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 483025 = 4016^2 + 695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16611281 is a prime.

It is a super-2 number, since 2×16611281² = 551869312921922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16611281.

It is not a weakly prime, because it can be changed into another prime (16611181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8305640 + 8305641.

It is an arithmetic number, because the mean of its divisors is an integer number (8305641).

Almost surely, 2^16611281 is an apocalyptic number.

It is an amenable number.

16611281 is a deficient number, since it is larger than the sum of its proper divisors (1).

16611281 is an equidigital number, since it uses as much as digits as its factorization.

16611281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 26.

The square root of 16611281 is about 4075.6939286458. The cubic root of 16611281 is about 255.1532130648.

The spelling of 16611281 in words is "sixteen million, six hundred eleven thousand, two hundred eighty-one".