16810081 has 2 divisors, whose sum is σ = 16810082. Its totient is φ = 16810080.

The previous prime is 16810061. The next prime is 16810097. The reversal of 16810081 is 18001861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 81 = 4100^2 + 9^2 .It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 18001891 and 19810081.

It is a cyclic number.

It is not a de Polignac number, because 16810081 - 2⁵ = 16810049 is a prime.

It is a super-2 number, since 2×16810081² = 565157646453122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16810061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8405040 + 8405041.

It is an arithmetic number, because the mean of its divisors is an integer number (8405041).

Almost surely, 2^16810081 is an apocalyptic number.

It is an amenable number.

16810081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16810081 is an equidigital number, since it uses as much as digits as its factorization.

16810081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 16810081 is about 4100.0098780369. The cubic root of 16810081 is about 256.1670510025.

It can be divided in two parts, 168100 and 81, that multiplied together give a square (13616100 = 3690²).

The spelling of 16810081 in words is "sixteen million, eight hundred ten thousand, eighty-one".