171342805 has 4 divisors (see below), whose sum is σ = 205611372. Its totient is φ = 137074240.

The previous prime is 171342803. The next prime is 171342823. The reversal of 171342805 is 508243171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508243171 = 31 ⋅16394941.

It can be written as a sum of positive squares in 2 ways, for example, as 24860196 + 146482609 = 4986^2 + 12103^2 .

It is not a de Polignac number, because 171342805 - 2¹ = 171342803 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 (171342803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17134276 + ... + 17134285.

It is an arithmetic number, because the mean of its divisors is an integer number (51402843).

Almost surely, 2^171342805 is an apocalyptic number.

It is an amenable number.

171342805 is a deficient number, since it is larger than the sum of its proper divisors (34268567).

171342805 is an equidigital number, since it uses as much as digits as its factorization.

171342805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34268566.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 171342805 is about 13089.7977448087. The cubic root of 171342805 is about 555.4205669736.

Adding to 171342805 its reverse (508243171), we get a palindrome (679585976).

The spelling of 171342805 in words is "one hundred seventy-one million, three hundred forty-two thousand, eight hundred five".