170993993 has 4 divisors (see below), whose sum is σ = 171126528. Its totient is φ = 170861460.

The previous prime is 170993981. The next prime is 170994011. The reversal of 170993993 is 399399071.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 170993993 - 2²⁶ = 103885129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170993093) 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, 64313 + ... + 66918.

It is an arithmetic number, because the mean of its divisors is an integer number (42781632).

Almost surely, 2^170993993 is an apocalyptic number.

It is an amenable number.

170993993 is a deficient number, since it is larger than the sum of its proper divisors (132535).

170993993 is a wasteful number, since it uses less digits than its factorization.

170993993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132534.

The product of its (nonzero) digits is 413343, while the sum is 50.

The square root of 170993993 is about 13076.4671452193. The cubic root of 170993993 is about 555.0434108295.

The spelling of 170993993 in words is "one hundred seventy million, nine hundred ninety-three thousand, nine hundred ninety-three".