170993 has 4 divisors (see below), whose sum is σ = 172788. Its totient is φ = 169200.

The previous prime is 170971. The next prime is 171007. The reversal of 170993 is 399071.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123904 + 47089 = 352^2 + 217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746 + ... + 947.

It is an arithmetic number, because the mean of its divisors is an integer number (43197).

2¹⁷⁰⁹⁹³ is an apocalyptic number.

It is an amenable number.

170993 is a deficient number, since it is larger than the sum of its proper divisors (1795).

170993 is a wasteful number, since it uses less digits than its factorization.

170993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794.

The product of its (nonzero) digits is 1701, while the sum is 29.

The square root of 170993 is about 413.5129985865. The cubic root of 170993 is about 55.5042336407.

The spelling of 170993 in words is "one hundred seventy thousand, nine hundred ninety-three".