173684989 has 2 divisors, whose sum is σ = 173684990. Its totient is φ = 173684988.

The previous prime is 173684981. The next prime is 173685007. The reversal of 173684989 is 989486371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163712025 + 9972964 = 12795^2 + 3158^2 .

It is a cyclic number.

It is not a de Polignac number, because 173684989 - 2³ = 173684981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173684981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86842494 + 86842495.

It is an arithmetic number, because the mean of its divisors is an integer number (86842495).

Almost surely, 2^173684989 is an apocalyptic number.

It is an amenable number.

173684989 is a deficient number, since it is larger than the sum of its proper divisors (1).

173684989 is an equidigital number, since it uses as much as digits as its factorization.

173684989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 55.

The square root of 173684989 is about 13178.9600879584. The cubic root of 173684989 is about 557.9399105825.

The spelling of 173684989 in words is "one hundred seventy-three million, six hundred eighty-four thousand, nine hundred eighty-nine".