499981500171 has 24 divisors (see below), whose sum is σ = 731459352000. Its totient is φ = 329046786432.

The previous prime is 499981500157. The next prime is 499981500191. The reversal of 499981500171 is 171005189994.

499981500171 is a `hidden beast` number, since 49 + 9 + 9 + 81 + 500 + 17 + 1 = 666.

499981500171 is a nontrivial binomial coefficient, being equal to C(999982, 2).

It is not a de Polignac number, because 499981500171 - 2⁹ = 499981499659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (499981500101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4444365 + ... + 4555473.

It is an arithmetic number, because the mean of its divisors is an integer number (30477473000).

Almost surely, 2^499981500171 is an apocalyptic number.

499981500171 is the 999981-st triangular number and also the 499991-st hexagonal number.

499981500171 is a deficient number, since it is larger than the sum of its proper divisors (231477851829).

499981500171 is a wasteful number, since it uses less digits than its factorization.

499981500171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117523 (or 117520 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 54.

The spelling of 499981500171 in words is "four hundred ninety-nine billion, nine hundred eighty-one million, five hundred thousand, one hundred seventy-one".