171139231 has 4 divisors (see below), whose sum is σ = 172486912. Its totient is φ = 169791552.

The previous prime is 171139223. The next prime is 171139253. The reversal of 171139231 is 132931171.

171139231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132931171 = 421 ⋅315751.

It is a cyclic number.

It is not a de Polignac number, because 171139231 - 2³ = 171139223 is a prime.

It is a super-2 number, since 2×171139231² = 58577272774542722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 171139231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171139261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 673650 + ... + 673903.

It is an arithmetic number, because the mean of its divisors is an integer number (43121728).

Almost surely, 2^171139231 is an apocalyptic number.

171139231 is a deficient number, since it is larger than the sum of its proper divisors (1347681).

171139231 is a wasteful number, since it uses less digits than its factorization.

171139231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347680.

The product of its digits is 1134, while the sum is 28.

The square root of 171139231 is about 13082.0193777566. The cubic root of 171139231 is about 555.2005129993.

The spelling of 171139231 in words is "one hundred seventy-one million, one hundred thirty-nine thousand, two hundred thirty-one".