418319821 has 2 divisors, whose sum is σ = 418319822. Its totient is φ = 418319820.

The previous prime is 418319819. The next prime is 418319849. The reversal of 418319821 is 128913814.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384552100 + 33767721 = 19610^2 + 5811^2 .

It is a cyclic number.

It is not a de Polignac number, because 418319821 - 2¹ = 418319819 is a prime.

Together with 418319819, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (418319861) 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, 209159910 + 209159911.

It is an arithmetic number, because the mean of its divisors is an integer number (209159911).

Almost surely, 2^418319821 is an apocalyptic number.

It is an amenable number.

418319821 is a deficient number, since it is larger than the sum of its proper divisors (1).

418319821 is an equidigital number, since it uses as much as digits as its factorization.

418319821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 37.

The square root of 418319821 is about 20452.8682829573. The cubic root of 418319821 is about 747.8872814078.

The spelling of 418319821 in words is "four hundred eighteen million, three hundred nineteen thousand, eight hundred twenty-one".