2811862681 has 2 divisors, whose sum is σ = 2811862682. Its totient is φ = 2811862680.

The previous prime is 2811862639. The next prime is 2811862699. The reversal of 2811862681 is 1862681182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2169696400 + 642166281 = 46580^2 + 25341^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811862681 - 2¹¹ = 2811860633 is a prime.

It is a super-2 number, since 2×2811862681² = 15813143473601015522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2811862601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405931340 + 1405931341.

It is an arithmetic number, because the mean of its divisors is an integer number (1405931341).

Almost surely, 2^2811862681 is an apocalyptic number.

It is an amenable number.

2811862681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2811862681 is an equidigital number, since it uses as much as digits as its factorization.

2811862681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 43.

The square root of 2811862681 is about 53026.9995474004. Note that the first 3 decimals coincide. The cubic root of 2811862681 is about 1411.4474147976.

The spelling of 2811862681 in words is "two billion, eight hundred eleven million, eight hundred sixty-two thousand, six hundred eighty-one".