170838989 has 2 divisors, whose sum is σ = 170838990. Its totient is φ = 170838988.

The previous prime is 170838977. The next prime is 170839007. The reversal of 170838989 is 989838071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99301225 + 71537764 = 9965^2 + 8458^2 .

It is an emirp because it is prime and its reverse (989838071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 170838989 - 2⁴ = 170838973 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 170838989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170838929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85419494 + 85419495.

It is an arithmetic number, because the mean of its divisors is an integer number (85419495).

Almost surely, 2^170838989 is an apocalyptic number.

It is an amenable number.

170838989 is a deficient number, since it is larger than the sum of its proper divisors (1).

170838989 is an equidigital number, since it uses as much as digits as its factorization.

170838989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 170838989 is about 13070.5389712896. The cubic root of 170838989 is about 554.8756467330.

The spelling of 170838989 in words is "one hundred seventy million, eight hundred thirty-eight thousand, nine hundred eighty-nine".