2128622857 has 2 divisors, whose sum is σ = 2128622858. Its totient is φ = 2128622856.

The previous prime is 2128622767. The next prime is 2128622861. The reversal of 2128622857 is 7582268212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2096632521 + 31990336 = 45789^2 + 5656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2128622857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2128622557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064311428 + 1064311429.

It is an arithmetic number, because the mean of its divisors is an integer number (1064311429).

Almost surely, 2^2128622857 is an apocalyptic number.

It is an amenable number.

2128622857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128622857 is an equidigital number, since it uses as much as digits as its factorization.

2128622857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 43.

The square root of 2128622857 is about 46137.0009536814. Note that the first 3 decimals coincide. The cubic root of 2128622857 is about 1286.3709989892.

The spelling of 2128622857 in words is "two billion, one hundred twenty-eight million, six hundred twenty-two thousand, eight hundred fifty-seven".