2811079981 has 2 divisors, whose sum is σ = 2811079982. Its totient is φ = 2811079980.

The previous prime is 2811079937. The next prime is 2811079991. The reversal of 2811079981 is 1899701182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2203457481 + 607622500 = 46941^2 + 24650^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811079981 - 2⁷ = 2811079853 is a prime.

It is a super-2 number, since 2×2811079981² = 15804341319157920722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2811079991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405539990 + 1405539991.

It is an arithmetic number, because the mean of its divisors is an integer number (1405539991).

Almost surely, 2^2811079981 is an apocalyptic number.

It is an amenable number.

2811079981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2811079981 is an equidigital number, since it uses as much as digits as its factorization.

2811079981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 46.

The square root of 2811079981 is about 53019.6188311459. The cubic root of 2811079981 is about 1411.3164408328.

The spelling of 2811079981 in words is "two billion, eight hundred eleven million, seventy-nine thousand, nine hundred eighty-one".