169538009 has 2 divisors, whose sum is σ = 169538010. Its totient is φ = 169538008.

The previous prime is 169537997. The next prime is 169538027. The reversal of 169538009 is 900835961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95491984 + 74046025 = 9772^2 + 8605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-169538009 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (169538069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84769004 + 84769005.

It is an arithmetic number, because the mean of its divisors is an integer number (84769005).

Almost surely, 2^169538009 is an apocalyptic number.

It is an amenable number.

169538009 is a deficient number, since it is larger than the sum of its proper divisors (1).

169538009 is an equidigital number, since it uses as much as digits as its factorization.

169538009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 169538009 is about 13020.6762113187. The cubic root of 169538009 is about 553.4635523188.

The spelling of 169538009 in words is "one hundred sixty-nine million, five hundred thirty-eight thousand, nine".