169210081 has 2 divisors, whose sum is σ = 169210082. Its totient is φ = 169210080.

The previous prime is 169210049. The next prime is 169210087. The reversal of 169210081 is 180012961.

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., 166823056 + 2387025 = 12916^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 169210081 - 2⁵ = 169210049 is a prime.

It is a super-2 number, since 2×169210081² = 57264103024053122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (169210087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84605040 + 84605041.

It is an arithmetic number, because the mean of its divisors is an integer number (84605041).

Almost surely, 2^169210081 is an apocalyptic number.

It is an amenable number.

169210081 is a deficient number, since it is larger than the sum of its proper divisors (1).

169210081 is an equidigital number, since it uses as much as digits as its factorization.

169210081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 169210081 is about 13008.0775289818. The cubic root of 169210081 is about 553.1064773437.

The spelling of 169210081 in words is "one hundred sixty-nine million, two hundred ten thousand, eighty-one".