499999321 has 2 divisors, whose sum is σ = 499999322. Its totient is φ = 499999320.

The previous prime is 499999319. The next prime is 499999327. The reversal of 499999321 is 123999994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355134025 + 144865296 = 18845^2 + 12036^2 .

It is a cyclic number.

It is not a de Polignac number, because 499999321 - 2¹ = 499999319 is a prime.

It is a super-2 number, since 2×499999321² = 499998642000922082, which contains 22 as substring.

Together with 499999319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (499999327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249999660 + 249999661.

It is an arithmetic number, because the mean of its divisors is an integer number (249999661).

Almost surely, 2^499999321 is an apocalyptic number.

It is an amenable number.

499999321 is a deficient number, since it is larger than the sum of its proper divisors (1).

499999321 is an equidigital number, since it uses as much as digits as its factorization.

499999321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1417176, while the sum is 55.

The square root of 499999321 is about 22360.6645920912. The cubic root of 499999321 is about 793.7001667022.

The spelling of 499999321 in words is "four hundred ninety-nine million, nine hundred ninety-nine thousand, three hundred twenty-one".