169625009 has 2 divisors, whose sum is σ = 169625010. Its totient is φ = 169625008.

The previous prime is 169624993. The next prime is 169625033. The reversal of 169625009 is 900526961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165045409 + 4579600 = 12847^2 + 2140^2 .

It is an emirp because it is prime and its reverse (900526961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 169625009 - 2⁴ = 169624993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (169025009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84812504 + 84812505.

It is an arithmetic number, because the mean of its divisors is an integer number (84812505).

Almost surely, 2^169625009 is an apocalyptic number.

It is an amenable number.

169625009 is a deficient number, since it is larger than the sum of its proper divisors (1).

169625009 is an equidigital number, since it uses as much as digits as its factorization.

169625009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 169625009 is about 13024.0166231466. The cubic root of 169625009 is about 553.5582077794.

The spelling of 169625009 in words is "one hundred sixty-nine million, six hundred twenty-five thousand, nine".