171129139 has 2 divisors, whose sum is σ = 171129140. Its totient is φ = 171129138.

The previous prime is 171129137. The next prime is 171129149. The reversal of 171129139 is 931921171.

171129139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (931921171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 171129139 - 2¹ = 171129137 is a prime.

Together with 171129137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (171129137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85564569 + 85564570.

It is an arithmetic number, because the mean of its divisors is an integer number (85564570).

Almost surely, 2^171129139 is an apocalyptic number.

171129139 is a deficient number, since it is larger than the sum of its proper divisors (1).

171129139 is an equidigital number, since it uses as much as digits as its factorization.

171129139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 34.

The square root of 171129139 is about 13081.6336518036. The cubic root of 171129139 is about 555.1895994804.

The spelling of 171129139 in words is "one hundred seventy-one million, one hundred twenty-nine thousand, one hundred thirty-nine".