169351409 has 2 divisors, whose sum is σ = 169351410. Its totient is φ = 169351408.

The previous prime is 169351381. The next prime is 169351421. The reversal of 169351409 is 904153961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163456225 + 5895184 = 12785^2 + 2428^2 .

It is a cyclic number.

It is not a de Polignac number, because 169351409 - 2¹² = 169347313 is a prime.

It is not a weakly prime, because it can be changed into another prime (169351439) 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, 84675704 + 84675705.

It is an arithmetic number, because the mean of its divisors is an integer number (84675705).

Almost surely, 2^169351409 is an apocalyptic number.

It is an amenable number.

169351409 is a deficient number, since it is larger than the sum of its proper divisors (1).

169351409 is an equidigital number, since it uses as much as digits as its factorization.

169351409 is an odious number, because the sum of its binary digits is odd.

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

The square root of 169351409 is about 13013.5087121037. The cubic root of 169351409 is about 553.2604234107.

The spelling of 169351409 in words is "one hundred sixty-nine million, three hundred fifty-one thousand, four hundred nine".