2071171811 has 4 divisors (see below), whose sum is σ = 2071263432. Its totient is φ = 2071080192.

The previous prime is 2071171807. The next prime is 2071171853. The reversal of 2071171811 is 1181711702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1181711702 = 2 ⋅590855851.

It is a cyclic number.

It is not a de Polignac number, because 2071171811 - 2² = 2071171807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2071111811) 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 in 3 ways as a sum of consecutive naturals, for example, 15056 + ... + 66098.

It is an arithmetic number, because the mean of its divisors is an integer number (517815858).

Almost surely, 2^2071171811 is an apocalyptic number.

2071171811 is a deficient number, since it is larger than the sum of its proper divisors (91621).

2071171811 is an equidigital number, since it uses as much as digits as its factorization.

2071171811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91620.

The product of its (nonzero) digits is 784, while the sum is 29.

The square root of 2071171811 is about 45510.1286638480. The cubic root of 2071171811 is about 1274.6923386332.

The spelling of 2071171811 in words is "two billion, seventy-one million, one hundred seventy-one thousand, eight hundred eleven".