163343989 has 2 divisors, whose sum is σ = 163343990. Its totient is φ = 163343988.

The previous prime is 163343981. The next prime is 163344017. The reversal of 163343989 is 989343361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157703364 + 5640625 = 12558^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 163343989 - 2³ = 163343981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163343981) 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, 81671994 + 81671995.

It is an arithmetic number, because the mean of its divisors is an integer number (81671995).

Almost surely, 2^163343989 is an apocalyptic number.

It is an amenable number.

163343989 is a deficient number, since it is larger than the sum of its proper divisors (1).

163343989 is an equidigital number, since it uses as much as digits as its factorization.

163343989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 46.

The square root of 163343989 is about 12780.6098837262. The cubic root of 163343989 is about 546.6395527814.

It can be divided in two parts, 1633439 and 89, that added together give a triangular number (1633528 = T₁₈₀₇).

The spelling of 163343989 in words is "one hundred sixty-three million, three hundred forty-three thousand, nine hundred eighty-nine".