11011322981 has 2 divisors, whose sum is σ = 11011322982. Its totient is φ = 11011322980.

The previous prime is 11011322969. The next prime is 11011323049. The reversal of 11011322981 is 18922311011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11010304900 + 1018081 = 104930^2 + 1009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011322981 is a prime.

It is a super-2 number, since 2×11011322981² (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 (11011322941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505661490 + 5505661491.

It is an arithmetic number, because the mean of its divisors is an integer number (5505661491).

Almost surely, 2^11011322981 is an apocalyptic number.

It is an amenable number.

11011322981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011322981 is an equidigital number, since it uses as much as digits as its factorization.

11011322981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 29.

Adding to 11011322981 its reverse (18922311011), we get a palindrome (29933633992).

The spelling of 11011322981 in words is "eleven billion, eleven million, three hundred twenty-two thousand, nine hundred eighty-one".