169009 has 2 divisors, whose sum is σ = 169010. Its totient is φ = 169008.

The previous prime is 169007. The next prime is 169019. The reversal of 169009 is 900961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138384 + 30625 = 372^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 169009 - 2¹ = 169007 is a prime.

Together with 169007, it forms a pair of twin primes.

169009 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (169003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84504 + 84505.

It is an arithmetic number, because the mean of its divisors is an integer number (84505).

2¹⁶⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

169009 is a deficient number, since it is larger than the sum of its proper divisors (1).

169009 is an equidigital number, since it uses as much as digits as its factorization.

169009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 169009 is about 411.1070420219. The cubic root of 169009 is about 55.2887295587.

It can be divided in two parts, 16900 and 9, that multiplied together give a square (152100 = 390²).

The spelling of 169009 in words is "one hundred sixty-nine thousand, nine".