896661809 has 2 divisors, whose sum is σ = 896661810. Its totient is φ = 896661808.

The previous prime is 896661793. The next prime is 896661823. The reversal of 896661809 is 908166698.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 845181184 + 51480625 = 29072^2 + 7175^2 .

It is a cyclic number.

It is not a de Polignac number, because 896661809 - 2⁴ = 896661793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (896661869) 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, 448330904 + 448330905.

It is an arithmetic number, because the mean of its divisors is an integer number (448330905).

Almost surely, 2^896661809 is an apocalyptic number.

It is an amenable number.

896661809 is a deficient number, since it is larger than the sum of its proper divisors (1).

896661809 is an equidigital number, since it uses as much as digits as its factorization.

896661809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 53.

The square root of 896661809 is about 29944.3117970676. The cubic root of 896661809 is about 964.2942064568.

The spelling of 896661809 in words is "eight hundred ninety-six million, six hundred sixty-one thousand, eight hundred nine".