16808881 has 2 divisors, whose sum is σ = 16808882. Its totient is φ = 16808880.

The previous prime is 16808833. The next prime is 16808921. The reversal of 16808881 is 18880861.

It is an a-pointer prime, because the next prime (16808921) can be obtained adding 16808881 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16128256 + 680625 = 4016^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 16808881 - 2¹¹ = 16806833 is a prime.

It is a super-2 number, since 2×16808881² = 565076960944322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16808821) 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, 8404440 + 8404441.

It is an arithmetic number, because the mean of its divisors is an integer number (8404441).

Almost surely, 2^16808881 is an apocalyptic number.

It is an amenable number.

16808881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16808881 is an equidigital number, since it uses as much as digits as its factorization.

16808881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 16808881 is about 4099.8635343143. The cubic root of 16808881 is about 256.1609552997.

It can be divided in two parts, 16808 and 881, that added together give a square (17689 = 133²).

The spelling of 16808881 in words is "sixteen million, eight hundred eight thousand, eight hundred eighty-one".