171642871 has 2 divisors, whose sum is σ = 171642872. Its totient is φ = 171642870.

The previous prime is 171642857. The next prime is 171642883. The reversal of 171642871 is 178246171.

It is a strong prime.

It is an emirp because it is prime and its reverse (178246171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171642871 - 2⁵ = 171642839 is a prime.

It is a super-2 number, since 2×171642871² = 58922550330245282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 171642871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171642841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85821435 + 85821436.

It is an arithmetic number, because the mean of its divisors is an integer number (85821436).

Almost surely, 2^171642871 is an apocalyptic number.

171642871 is a deficient number, since it is larger than the sum of its proper divisors (1).

171642871 is an equidigital number, since it uses as much as digits as its factorization.

171642871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18816, while the sum is 37.

The square root of 171642871 is about 13101.2545582475. The cubic root of 171642871 is about 555.7446067105.

The spelling of 171642871 in words is "one hundred seventy-one million, six hundred forty-two thousand, eight hundred seventy-one".