171642239 has 2 divisors, whose sum is σ = 171642240. Its totient is φ = 171642238.

The previous prime is 171642221. The next prime is 171642253. The reversal of 171642239 is 932246171.

It is a strong prime.

It is an emirp because it is prime and its reverse (932246171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171642239 - 2¹² = 171638143 is a prime.

It is a super-2 number, since 2×171642239² = 58922116417866242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 171642199 and 171642208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171642209) 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 as a sum of consecutive naturals, namely, 85821119 + 85821120.

It is an arithmetic number, because the mean of its divisors is an integer number (85821120).

Almost surely, 2^171642239 is an apocalyptic number.

171642239 is a deficient number, since it is larger than the sum of its proper divisors (1).

171642239 is an equidigital number, since it uses as much as digits as its factorization.

171642239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 171642239 is about 13101.2304383978. The cubic root of 171642239 is about 555.7439246139.

The spelling of 171642239 in words is "one hundred seventy-one million, six hundred forty-two thousand, two hundred thirty-nine".