1100009978981 has 2 divisors, whose sum is σ = 1100009978982. Its totient is φ = 1100009978980.

The previous prime is 1100009978911. The next prime is 1100009978993. The reversal of 1100009978981 is 1898799000011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1059108556900 + 40901422081 = 1029130^2 + 202241^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100009978981 - 2¹⁸ = 1100009716837 is a prime.

It is a super-2 number, since 2×1100009978981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100009978911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550004989490 + 550004989491.

It is an arithmetic number, because the mean of its divisors is an integer number (550004989491).

Almost surely, 2^{1100009978981} is an apocalyptic number.

It is an amenable number.

1100009978981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100009978981 is an equidigital number, since it uses as much as digits as its factorization.

1100009978981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 53.

The spelling of 1100009978981 in words is "one trillion, one hundred billion, nine million, nine hundred seventy-eight thousand, nine hundred eighty-one".