171431939 has 12 divisors (see below), whose sum is σ = 199985184. Its totient is φ = 146525904.

The previous prime is 171431879. The next prime is 171431969. The reversal of 171431939 is 939134171.

It is not a de Polignac number, because 171431939 - 2¹² = 171427843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171431969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13217 + ... + 22749.

It is an arithmetic number, because the mean of its divisors is an integer number (16665432).

Almost surely, 2^171431939 is an apocalyptic number.

171431939 is a deficient number, since it is larger than the sum of its proper divisors (28553245).

171431939 is an equidigital number, since it uses as much as digits as its factorization.

171431939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9914 (or 9907 counting only the distinct ones).

The product of its digits is 20412, while the sum is 38.

The square root of 171431939 is about 13093.2020147861. The cubic root of 171431939 is about 555.5168617955.

The spelling of 171431939 in words is "one hundred seventy-one million, four hundred thirty-one thousand, nine hundred thirty-nine".