499991171 has 2 divisors, whose sum is σ = 499991172. Its totient is φ = 499991170.

The previous prime is 499991119. The next prime is 499991189. The reversal of 499991171 is 171199994.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-499991171 is a prime.

It is not a weakly prime, because it can be changed into another prime (499991071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249995585 + 249995586.

It is an arithmetic number, because the mean of its divisors is an integer number (249995586).

Almost surely, 2^499991171 is an apocalyptic number.

499991171 is a deficient number, since it is larger than the sum of its proper divisors (1).

499991171 is an equidigital number, since it uses as much as digits as its factorization.

499991171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 50.

The square root of 499991171 is about 22360.4823516846. The cubic root of 499991171 is about 793.6958542353.

The spelling of 499991171 in words is "four hundred ninety-nine million, nine hundred ninety-one thousand, one hundred seventy-one".