171217939 has 8 divisors (see below), whose sum is σ = 173659392. Its totient is φ = 168792960.

The previous prime is 171217913. The next prime is 171217967. The reversal of 171217939 is 939712171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 171217939 - 2⁷ = 171217811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171217909) 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 7 ways as a sum of consecutive naturals, for example, 17617 + ... + 25549.

It is an arithmetic number, because the mean of its divisors is an integer number (21707424).

Almost surely, 2^171217939 is an apocalyptic number.

171217939 is a deficient number, since it is larger than the sum of its proper divisors (2441453).

171217939 is a wasteful number, since it uses less digits than its factorization.

171217939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8237.

The product of its digits is 23814, while the sum is 40.

The square root of 171217939 is about 13085.0272831202. The cubic root of 171217939 is about 555.2856133478.

The spelling of 171217939 in words is "one hundred seventy-one million, two hundred seventeen thousand, nine hundred thirty-nine".