2128806257 has 2 divisors, whose sum is σ = 2128806258. Its totient is φ = 2128806256.

The previous prime is 2128806247. The next prime is 2128806293. The reversal of 2128806257 is 7526088212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2106442816 + 22363441 = 45896^2 + 4729^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128806257 - 2⁴ = 2128806241 is a prime.

It is not a weakly prime, because it can be changed into another prime (2128806247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064403128 + 1064403129.

It is an arithmetic number, because the mean of its divisors is an integer number (1064403129).

Almost surely, 2^2128806257 is an apocalyptic number.

It is an amenable number.

2128806257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128806257 is an equidigital number, since it uses as much as digits as its factorization.

2128806257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 2128806257 is about 46138.9884696230. The cubic root of 2128806257 is about 1286.4079420711.

The spelling of 2128806257 in words is "two billion, one hundred twenty-eight million, eight hundred six thousand, two hundred fifty-seven".