170256993 has 4 divisors (see below), whose sum is σ = 227009328. Its totient is φ = 113504660.

The previous prime is 170256979. The next prime is 170257027. The reversal of 170256993 is 399652071.

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 170256993 - 2⁹ = 170256481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (170256953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28376163 + ... + 28376168.

It is an arithmetic number, because the mean of its divisors is an integer number (56752332).

Almost surely, 2^170256993 is an apocalyptic number.

It is an amenable number.

170256993 is a deficient number, since it is larger than the sum of its proper divisors (56752335).

170256993 is an equidigital number, since it uses as much as digits as its factorization.

170256993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56752334.

The product of its (nonzero) digits is 102060, while the sum is 42.

The square root of 170256993 is about 13048.2563202905. The cubic root of 170256993 is about 554.2448328531.

The spelling of 170256993 in words is "one hundred seventy million, two hundred fifty-six thousand, nine hundred ninety-three".