2111809057 has 2 divisors, whose sum is σ = 2111809058. Its totient is φ = 2111809056.

The previous prime is 2111809033. The next prime is 2111809079. The reversal of 2111809057 is 7509081112.

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., 1111288896 + 1000520161 = 33336^2 + 31631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111809057 is a prime.

It is not a weakly prime, because it can be changed into another prime (2111809027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055904528 + 1055904529.

It is an arithmetic number, because the mean of its divisors is an integer number (1055904529).

Almost surely, 2^2111809057 is an apocalyptic number.

It is an amenable number.

2111809057 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111809057 is an equidigital number, since it uses as much as digits as its factorization.

2111809057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 2111809057 is about 45954.4236934813. The cubic root of 2111809057 is about 1282.9750656672.

The spelling of 2111809057 in words is "two billion, one hundred eleven million, eight hundred nine thousand, fifty-seven".