2128736081 has 2 divisors, whose sum is σ = 2128736082. Its totient is φ = 2128736080.

The previous prime is 2128736063. The next prime is 2128736083. The reversal of 2128736081 is 1806378212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2041593856 + 87142225 = 45184^2 + 9335^2 .

It is a cyclic number.

It is not a de Polignac number, because 2128736081 - 2¹⁰ = 2128735057 is a prime.

It is a super-2 number, since 2×2128736081² = 9063034605102477122, which contains 22 as substring.

Together with 2128736083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2128736083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1064368040 + 1064368041.

It is an arithmetic number, because the mean of its divisors is an integer number (1064368041).

Almost surely, 2^2128736081 is an apocalyptic number.

It is an amenable number.

2128736081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2128736081 is an equidigital number, since it uses as much as digits as its factorization.

2128736081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 2128736081 is about 46138.2279785429. The cubic root of 2128736081 is about 1286.3938064563.

The spelling of 2128736081 in words is "two billion, one hundred twenty-eight million, seven hundred thirty-six thousand, eighty-one".