170493989 has 2 divisors, whose sum is σ = 170493990. Its totient is φ = 170493988.

The previous prime is 170493977. The next prime is 170493997. The reversal of 170493989 is 989394071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164685889 + 5808100 = 12833^2 + 2410^2 .

It is an emirp because it is prime and its reverse (989394071) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170493989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (170493919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85246994 + 85246995.

It is an arithmetic number, because the mean of its divisors is an integer number (85246995).

Almost surely, 2^170493989 is an apocalyptic number.

It is an amenable number.

170493989 is a deficient number, since it is larger than the sum of its proper divisors (1).

170493989 is an equidigital number, since it uses as much as digits as its factorization.

170493989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 170493989 is about 13057.3346820858. The cubic root of 170493989 is about 554.5018813409.

The spelling of 170493989 in words is "one hundred seventy million, four hundred ninety-three thousand, nine hundred eighty-nine".