11056087981 has 2 divisors, whose sum is σ = 11056087982. Its totient is φ = 11056087980.

The previous prime is 11056087967. The next prime is 11056088009. The reversal of 11056087981 is 18978065011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9379922500 + 1676165481 = 96850^2 + 40941^2 .

It is a cyclic number.

It is not a de Polignac number, because 11056087981 - 2¹⁷ = 11055956909 is a prime.

It is a super-2 number, since 2×11056087981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11056087961) 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, 5528043990 + 5528043991.

It is an arithmetic number, because the mean of its divisors is an integer number (5528043991).

Almost surely, 2^11056087981 is an apocalyptic number.

It is an amenable number.

11056087981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11056087981 is an equidigital number, since it uses as much as digits as its factorization.

11056087981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 46.

The spelling of 11056087981 in words is "eleven billion, fifty-six million, eighty-seven thousand, nine hundred eighty-one".