171942639 has 16 divisors (see below), whose sum is σ = 250387200. Its totient is φ = 104087360.

The previous prime is 171942637. The next prime is 171942649. The reversal of 171942639 is 936249171.

It is a cyclic number.

It is not a de Polignac number, because 171942639 - 2¹ = 171942637 is a prime.

It is a super-2 number, since 2×171942639² = 59128542212568642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 171942639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171942637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32134 + ... + 37100.

It is an arithmetic number, because the mean of its divisors is an integer number (15649200).

Almost surely, 2^171942639 is an apocalyptic number.

171942639 is a deficient number, since it is larger than the sum of its proper divisors (78444561).

171942639 is a wasteful number, since it uses less digits than its factorization.

171942639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6030.

The product of its digits is 81648, while the sum is 42.

The square root of 171942639 is about 13112.6899986235. The cubic root of 171942639 is about 556.0679477627.

The spelling of 171942639 in words is "one hundred seventy-one million, nine hundred forty-two thousand, six hundred thirty-nine".