171982042 has 4 divisors (see below), whose sum is σ = 257973066. Its totient is φ = 85991020.

The previous prime is 171982033. The next prime is 171982049. The reversal of 171982042 is 240289171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240289171 = 149 ⋅1612679.

It can be written as a sum of positive squares in only one way, i.e., 171845881 + 136161 = 13109^2 + 369^2 .

It is a junction number, because it is equal to n+sod(n) for n = 171981989 and 171982007.

It is not an unprimeable number, because it can be changed into a prime (171982049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42995509 + ... + 42995512.

Almost surely, 2^171982042 is an apocalyptic number.

171982042 is a deficient number, since it is larger than the sum of its proper divisors (85991024).

171982042 is an equidigital number, since it uses as much as digits as its factorization.

171982042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85991023.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 171982042 is about 13114.1923884012. The cubic root of 171982042 is about 556.1104213689.

The spelling of 171982042 in words is "one hundred seventy-one million, nine hundred eighty-two thousand, forty-two".