498666821 has 2 divisors, whose sum is σ = 498666822. Its totient is φ = 498666820.

The previous prime is 498666787. The next prime is 498666893. The reversal of 498666821 is 128666894.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481144225 + 17522596 = 21935^2 + 4186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-498666821 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 498666821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (498663821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249333410 + 249333411.

It is an arithmetic number, because the mean of its divisors is an integer number (249333411).

Almost surely, 2^498666821 is an apocalyptic number.

It is an amenable number.

498666821 is a deficient number, since it is larger than the sum of its proper divisors (1).

498666821 is an equidigital number, since it uses as much as digits as its factorization.

498666821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 50.

The square root of 498666821 is about 22330.8490882008. The cubic root of 498666821 is about 792.9944681618.

The spelling of 498666821 in words is "four hundred ninety-eight million, six hundred sixty-six thousand, eight hundred twenty-one".