2185756849 has 2 divisors, whose sum is σ = 2185756850. Its totient is φ = 2185756848.

The previous prime is 2185756847. The next prime is 2185756891. The reversal of 2185756849 is 9486575812.

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., 1272206224 + 913550625 = 35668^2 + 30225^2 .

It is a cyclic number.

It is not a de Polignac number, because 2185756849 - 2¹ = 2185756847 is a prime.

Together with 2185756847, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2185756849.

It is not a weakly prime, because it can be changed into another prime (2185756847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092878424 + 1092878425.

It is an arithmetic number, because the mean of its divisors is an integer number (1092878425).

Almost surely, 2^2185756849 is an apocalyptic number.

It is an amenable number.

2185756849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185756849 is an equidigital number, since it uses as much as digits as its factorization.

2185756849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 55.

The square root of 2185756849 is about 46752.0785527232. The cubic root of 2185756849 is about 1297.7786223548.

The spelling of 2185756849 in words is "two billion, one hundred eighty-five million, seven hundred fifty-six thousand, eight hundred forty-nine".