231868538171 has 4 divisors (see below), whose sum is σ = 233638527144. Its totient is φ = 230098549200.

The previous prime is 231868538137. The next prime is 231868538203. The reversal of 231868538171 is 171835868132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231868538171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231868538131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884994290 + ... + 884994551.

It is an arithmetic number, because the mean of its divisors is an integer number (58409631786).

Almost surely, 2^231868538171 is an apocalyptic number.

231868538171 is a deficient number, since it is larger than the sum of its proper divisors (1769988973).

231868538171 is a wasteful number, since it uses less digits than its factorization.

231868538171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769988972.

The product of its digits is 1935360, while the sum is 53.

The spelling of 231868538171 in words is "two hundred thirty-one billion, eight hundred sixty-eight million, five hundred thirty-eight thousand, one hundred seventy-one".