171199115231 has 4 divisors (see below), whose sum is σ = 180209595000. Its totient is φ = 162188635464.

The previous prime is 171199115167. The next prime is 171199115233. The reversal of 171199115231 is 132511991171.

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

It is a cyclic number.

It is not a de Polignac number, because 171199115231 - 2⁶ = 171199115167 is a prime.

It is a super-2 number, since 2×171199115231² (a number of 23 digits) 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 (171199115233) 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, 4505239856 + ... + 4505239893.

It is an arithmetic number, because the mean of its divisors is an integer number (45052398750).

Almost surely, 2^171199115231 is an apocalyptic number.

171199115231 is a deficient number, since it is larger than the sum of its proper divisors (9010479769).

171199115231 is an equidigital number, since it uses as much as digits as its factorization.

171199115231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010479768.

The product of its digits is 17010, while the sum is 41.

The spelling of 171199115231 in words is "one hundred seventy-one billion, one hundred ninety-nine million, one hundred fifteen thousand, two hundred thirty-one".