16885681 has 2 divisors, whose sum is σ = 16885682. Its totient is φ = 16885680.

The previous prime is 16885651. The next prime is 16885711. The reversal of 16885681 is 18658861.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (16885651) and next prime (16885711).

It can be written as a sum of positive squares in only one way, i.e., 14130081 + 2755600 = 3759^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 16885681 - 2¹³ = 16877489 is a prime.

It is a super-2 number, since 2×16885681² = 570252445667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16885621) 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, 8442840 + 8442841.

It is an arithmetic number, because the mean of its divisors is an integer number (8442841).

Almost surely, 2^16885681 is an apocalyptic number.

It is an amenable number.

16885681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16885681 is an equidigital number, since it uses as much as digits as its factorization.

16885681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 43.

The square root of 16885681 is about 4109.2190255570. The cubic root of 16885681 is about 256.5504968934.

It can be divided in two parts, 168 and 85681, that added together give a square (85849 = 293²).

The spelling of 16885681 in words is "sixteen million, eight hundred eighty-five thousand, six hundred eighty-one".