170842109 has 4 divisors (see below), whose sum is σ = 170951616. Its totient is φ = 170732604.

The previous prime is 170842079. The next prime is 170842127. The reversal of 170842109 is 901248071.

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, and also an emirpimes, since its reverse is a distinct semiprime: 901248071 = 19 ⋅47434109.

It is a cyclic number.

It is not a de Polignac number, because 170842109 - 2¹² = 170838013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170842159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52379 + ... + 55544.

It is an arithmetic number, because the mean of its divisors is an integer number (42737904).

Almost surely, 2^170842109 is an apocalyptic number.

It is an amenable number.

170842109 is a deficient number, since it is larger than the sum of its proper divisors (109507).

170842109 is a wasteful number, since it uses less digits than its factorization.

170842109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109506.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 170842109 is about 13070.6583231297. The cubic root of 170842109 is about 554.8790245753.

The spelling of 170842109 in words is "one hundred seventy million, eight hundred forty-two thousand, one hundred nine".