499231993 has 4 divisors (see below), whose sum is σ = 537634468. Its totient is φ = 460829520.

The previous prime is 499231987. The next prime is 499232017. The reversal of 499231993 is 399132994.

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

It can be written as a sum of positive squares in 2 ways, for example, as 257025024 + 242206969 = 16032^2 + 15563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-499231993 is a prime.

It is the 22344-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (499231903) by changing a digit.

It is a nontrivial repunit in base 22343.

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 3 ways as a sum of consecutive naturals, for example, 19201218 + ... + 19201243.

It is an arithmetic number, because the mean of its divisors is an integer number (134408617).

Almost surely, 2^499231993 is an apocalyptic number.

It is an amenable number.

499231993 is a deficient number, since it is larger than the sum of its proper divisors (38402475).

499231993 is a wasteful number, since it uses less digits than its factorization.

499231993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38402474.

The product of its digits is 472392, while the sum is 49.

The square root of 499231993 is about 22343.5000167834. The cubic root of 499231993 is about 793.2939393655.

The spelling of 499231993 in words is "four hundred ninety-nine million, two hundred thirty-one thousand, nine hundred ninety-three".