173402989 has 2 divisors, whose sum is σ = 173402990. Its totient is φ = 173402988.

The previous prime is 173402969. The next prime is 173403029. The reversal of 173402989 is 989204371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97416900 + 75986089 = 9870^2 + 8717^2 .

It is an emirp because it is prime and its reverse (989204371) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 173402989 - 2²¹ = 171305837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173402969) 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, 86701494 + 86701495.

It is an arithmetic number, because the mean of its divisors is an integer number (86701495).

Almost surely, 2^173402989 is an apocalyptic number.

It is an amenable number.

173402989 is a deficient number, since it is larger than the sum of its proper divisors (1).

173402989 is an equidigital number, since it uses as much as digits as its factorization.

173402989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 173402989 is about 13168.2568702163. The cubic root of 173402989 is about 557.6377845208.

The spelling of 173402989 in words is "one hundred seventy-three million, four hundred two thousand, nine hundred eighty-nine".