171129971 has 2 divisors, whose sum is σ = 171129972. Its totient is φ = 171129970.

The previous prime is 171129967. The next prime is 171129997. The reversal of 171129971 is 179921171.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171129971 - 2² = 171129967 is a prime.

It is not a weakly prime, because it can be changed into another prime (171129901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85564985 + 85564986.

It is an arithmetic number, because the mean of its divisors is an integer number (85564986).

Almost surely, 2^171129971 is an apocalyptic number.

171129971 is a deficient number, since it is larger than the sum of its proper divisors (1).

171129971 is an equidigital number, since it uses as much as digits as its factorization.

171129971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 38.

The square root of 171129971 is about 13081.6654520745. The cubic root of 171129971 is about 555.1904992239.

The spelling of 171129971 in words is "one hundred seventy-one million, one hundred twenty-nine thousand, nine hundred seventy-one".