1001111110981 has 2 divisors, whose sum is σ = 1001111110982. Its totient is φ = 1001111110980.

The previous prime is 1001111110973. The next prime is 1001111111029. The reversal of 1001111110981 is 1890111111001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749538646081 + 251572464900 = 865759^2 + 501570^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001111110981 - 2³ = 1001111110973 is a prime.

It is a super-2 number, since 2×1001111110981² (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 (1001111114981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500555555490 + 500555555491.

It is an arithmetic number, because the mean of its divisors is an integer number (500555555491).

Almost surely, 2^{1001111110981} is an apocalyptic number.

It is an amenable number.

1001111110981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001111110981 is an equidigital number, since it uses as much as digits as its factorization.

1001111110981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 25.

Adding to 1001111110981 its reverse (1890111111001), we get a palindrome (2891222221982).

The spelling of 1001111110981 in words is "one trillion, one billion, one hundred eleven million, one hundred ten thousand, nine hundred eighty-one".