2128985849 has 2 divisors, whose sum is σ = 2128985850. Its totient is φ = 2128985848.

The previous prime is 2128985737. The next prime is 2128985863. The reversal of 2128985849 is 9485898212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1068832249 + 1060153600 = 32693^2 + 32560^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128985849 - 2¹² = 2128981753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2128985794 and 2128985803.

It is not a weakly prime, because it can be changed into another prime (2128985899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064492924 + 1064492925.

It is an arithmetic number, because the mean of its divisors is an integer number (1064492925).

Almost surely, 2^2128985849 is an apocalyptic number.

It is an amenable number.

2128985849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128985849 is an equidigital number, since it uses as much as digits as its factorization.

2128985849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3317760, while the sum is 56.

The square root of 2128985849 is about 46140.9346350938. The cubic root of 2128985849 is about 1286.4441160345. Note that the first 3 decimals are identical.

The spelling of 2128985849 in words is "two billion, one hundred twenty-eight million, nine hundred eighty-five thousand, eight hundred forty-nine".