896561021 has 2 divisors, whose sum is σ = 896561022. Its totient is φ = 896561020.

The previous prime is 896560993. The next prime is 896561033. The reversal of 896561021 is 120165698.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894907225 + 1653796 = 29915^2 + 1286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-896561021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (896561221) 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, 448280510 + 448280511.

It is an arithmetic number, because the mean of its divisors is an integer number (448280511).

Almost surely, 2^896561021 is an apocalyptic number.

It is an amenable number.

896561021 is a deficient number, since it is larger than the sum of its proper divisors (1).

896561021 is an equidigital number, since it uses as much as digits as its factorization.

896561021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 896561021 is about 29942.6288258062. The cubic root of 896561021 is about 964.2580750617.

The spelling of 896561021 in words is "eight hundred ninety-six million, five hundred sixty-one thousand, twenty-one".