171891042 has 16 divisors (see below), whose sum is σ = 343994592. Its totient is φ = 57261600.

The previous prime is 171891017. The next prime is 171891047. The reversal of 171891042 is 240198171.

It is a junction number, because it is equal to n+sod(n) for n = 171890994 and 171891012.

It is not an unprimeable number, because it can be changed into a prime (171891047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2853 + ... + 18759.

It is an arithmetic number, because the mean of its divisors is an integer number (21499662).

Almost surely, 2^171891042 is an apocalyptic number.

171891042 is an abundant number, since it is smaller than the sum of its proper divisors (172103550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171891042 is a wasteful number, since it uses less digits than its factorization.

171891042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17713.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 171891042 is about 13110.7224057258. The cubic root of 171891042 is about 556.0123200865.

The spelling of 171891042 in words is "one hundred seventy-one million, eight hundred ninety-one thousand, forty-two".