499478321 has 2 divisors, whose sum is σ = 499478322. Its totient is φ = 499478320.

The previous prime is 499478311. The next prime is 499478323. The reversal of 499478321 is 123874994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495730225 + 3748096 = 22265^2 + 1936^2 .

It is a cyclic number.

It is not a de Polignac number, because 499478321 - 2⁶ = 499478257 is a prime.

Together with 499478323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (499478323) by changing a digit.

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 as a sum of consecutive naturals, namely, 249739160 + 249739161.

It is an arithmetic number, because the mean of its divisors is an integer number (249739161).

Almost surely, 2^499478321 is an apocalyptic number.

It is an amenable number.

499478321 is a deficient number, since it is larger than the sum of its proper divisors (1).

499478321 is an equidigital number, since it uses as much as digits as its factorization.

499478321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 499478321 is about 22349.0116336271. The cubic root of 499478321 is about 793.4243919952.

The spelling of 499478321 in words is "four hundred ninety-nine million, four hundred seventy-eight thousand, three hundred twenty-one".