169989641 has 2 divisors, whose sum is σ = 169989642. Its totient is φ = 169989640.

The previous prime is 169989607. The next prime is 169989643. The reversal of 169989641 is 146989961.

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., 114918400 + 55071241 = 10720^2 + 7421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169989641 is a prime.

Together with 169989643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (169989643) 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, 84994820 + 84994821.

It is an arithmetic number, because the mean of its divisors is an integer number (84994821).

Almost surely, 2^169989641 is an apocalyptic number.

It is an amenable number.

169989641 is a deficient number, since it is larger than the sum of its proper divisors (1).

169989641 is an equidigital number, since it uses as much as digits as its factorization.

169989641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 53.

The square root of 169989641 is about 13038.0075548375. The cubic root of 169989641 is about 553.9545734234.

The spelling of 169989641 in words is "one hundred sixty-nine million, nine hundred eighty-nine thousand, six hundred forty-one".