171431889450 has 48 divisors (see below), whose sum is σ = 438865648896. Its totient is φ = 44240486400.

The previous prime is 171431889449. The next prime is 171431889467. The reversal of 171431889450 is 54988134171.

It is a junction number, because it is equal to n+sod(n) for n = 171431889393 and 171431889402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18428887 + ... + 18438186.

It is an arithmetic number, because the mean of its divisors is an integer number (9143034352).

Almost surely, 2^171431889450 is an apocalyptic number.

171431889450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

171431889450 is an abundant number, since it is smaller than the sum of its proper divisors (267433759446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171431889450 is a wasteful number, since it uses less digits than its factorization.

171431889450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36867119 (or 36867114 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 51.

The spelling of 171431889450 in words is "one hundred seventy-one billion, four hundred thirty-one million, eight hundred eighty-nine thousand, four hundred fifty".