169352009 has 4 divisors (see below), whose sum is σ = 171098004. Its totient is φ = 167606016.

The previous prime is 169351999. The next prime is 169352021. The reversal of 169352009 is 900253961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900253961 = 269 ⋅3346669.

It can be written as a sum of positive squares in 2 ways, for example, as 31360000 + 137992009 = 5600^2 + 11747^2 .

It is a cyclic number.

It is not a de Polignac number, because 169352009 - 2⁴ = 169351993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 169352009.

It is not an unprimeable number, because it can be changed into a prime (169352069) 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 in 3 ways as a sum of consecutive naturals, for example, 872852 + ... + 873045.

It is an arithmetic number, because the mean of its divisors is an integer number (42774501).

Almost surely, 2^169352009 is an apocalyptic number.

It is an amenable number.

169352009 is a deficient number, since it is larger than the sum of its proper divisors (1745995).

169352009 is an equidigital number, since it uses as much as digits as its factorization.

169352009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745994.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 169352009 is about 13013.5317650513. The cubic root of 169352009 is about 553.2610767973.

The spelling of 169352009 in words is "one hundred sixty-nine million, three hundred fifty-two thousand, nine".