163443409 has 2 divisors, whose sum is σ = 163443410. Its totient is φ = 163443408.

The previous prime is 163443403. The next prime is 163443433. The reversal of 163443409 is 904344361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136890000 + 26553409 = 11700^2 + 5153^2 .

It is a cyclic number.

It is not a de Polignac number, because 163443409 - 2⁹ = 163442897 is a prime.

It is not a weakly prime, because it can be changed into another prime (163443403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81721704 + 81721705.

It is an arithmetic number, because the mean of its divisors is an integer number (81721705).

Almost surely, 2^163443409 is an apocalyptic number.

It is an amenable number.

163443409 is a deficient number, since it is larger than the sum of its proper divisors (1).

163443409 is an equidigital number, since it uses as much as digits as its factorization.

163443409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 163443409 is about 12784.4987778168. The cubic root of 163443409 is about 546.7504351025.

The spelling of 163443409 in words is "one hundred sixty-three million, four hundred forty-three thousand, four hundred nine".