896171821 has 2 divisors, whose sum is σ = 896171822. Its totient is φ = 896171820.

The previous prime is 896171819. The next prime is 896171831. The reversal of 896171821 is 128171698.

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., 857669796 + 38502025 = 29286^2 + 6205^2 .

It is a cyclic number.

It is not a de Polignac number, because 896171821 - 2¹ = 896171819 is a prime.

Together with 896171819, 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 (896171831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448085910 + 448085911.

It is an arithmetic number, because the mean of its divisors is an integer number (448085911).

Almost surely, 2^896171821 is an apocalyptic number.

It is an amenable number.

896171821 is a deficient number, since it is larger than the sum of its proper divisors (1).

896171821 is an equidigital number, since it uses as much as digits as its factorization.

896171821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 43.

The square root of 896171821 is about 29936.1290249758. The cubic root of 896171821 is about 964.1185256978.

The spelling of 896171821 in words is "eight hundred ninety-six million, one hundred seventy-one thousand, eight hundred twenty-one".