899644321 has 2 divisors, whose sum is σ = 899644322. Its totient is φ = 899644320.

The previous prime is 899644297. The next prime is 899644327. The reversal of 899644321 is 123446998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850363921 + 49280400 = 29161^2 + 7020^2 .

It is a cyclic number.

It is not a de Polignac number, because 899644321 - 2⁹ = 899643809 is a prime.

It is not a weakly prime, because it can be changed into another prime (899644327) 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, 449822160 + 449822161.

It is an arithmetic number, because the mean of its divisors is an integer number (449822161).

Almost surely, 2^899644321 is an apocalyptic number.

It is an amenable number.

899644321 is a deficient number, since it is larger than the sum of its proper divisors (1).

899644321 is an equidigital number, since it uses as much as digits as its factorization.

899644321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 899644321 is about 29994.0714308678. The cubic root of 899644321 is about 965.3621810699.

The spelling of 899644321 in words is "eight hundred ninety-nine million, six hundred forty-four thousand, three hundred twenty-one".