171942231 has 4 divisors (see below), whose sum is σ = 229256312. Its totient is φ = 114628152.

The previous prime is 171942203. The next prime is 171942241. The reversal of 171942231 is 132249171.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 171942231 - 2⁹ = 171941719 is a prime.

It is a super-2 number, since 2×171942231² = 59128261602514722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171942241) 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, 28657036 + ... + 28657041.

It is an arithmetic number, because the mean of its divisors is an integer number (57314078).

Almost surely, 2^171942231 is an apocalyptic number.

171942231 is a deficient number, since it is larger than the sum of its proper divisors (57314081).

171942231 is an equidigital number, since it uses as much as digits as its factorization.

171942231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57314080.

The product of its digits is 3024, while the sum is 30.

The square root of 171942231 is about 13112.6744411657. The cubic root of 171942231 is about 556.0675079340.

The spelling of 171942231 in words is "one hundred seventy-one million, nine hundred forty-two thousand, two hundred thirty-one".