894368821 has 2 divisors, whose sum is σ = 894368822. Its totient is φ = 894368820.

The previous prime is 894368819. The next prime is 894368843. The reversal of 894368821 is 128863498.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598047025 + 296321796 = 24455^2 + 17214^2 .

It is a cyclic number.

It is not a de Polignac number, because 894368821 - 2¹ = 894368819 is a prime.

Together with 894368819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (894368221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447184410 + 447184411.

It is an arithmetic number, because the mean of its divisors is an integer number (447184411).

Almost surely, 2^894368821 is an apocalyptic number.

It is an amenable number.

894368821 is a deficient number, since it is larger than the sum of its proper divisors (1).

894368821 is an equidigital number, since it uses as much as digits as its factorization.

894368821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 49.

The square root of 894368821 is about 29905.9997492142. Note that the first 3 decimals coincide. The cubic root of 894368821 is about 963.4715244843.

The spelling of 894368821 in words is "eight hundred ninety-four million, three hundred sixty-eight thousand, eight hundred twenty-one".