11012309981 has 2 divisors, whose sum is σ = 11012309982. Its totient is φ = 11012309980.

The previous prime is 11012309977. The next prime is 11012310011. The reversal of 11012309981 is 18990321011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10969210756 + 43099225 = 104734^2 + 6565^2 .

It is a cyclic number.

It is not a de Polignac number, because 11012309981 - 2² = 11012309977 is a prime.

It is a super-2 number, since 2×11012309981² (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 (11012309951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5506154990 + 5506154991.

It is an arithmetic number, because the mean of its divisors is an integer number (5506154991).

Almost surely, 2^11012309981 is an apocalyptic number.

It is an amenable number.

11012309981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11012309981 is an equidigital number, since it uses as much as digits as its factorization.

11012309981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 35.

The spelling of 11012309981 in words is "eleven billion, twelve million, three hundred nine thousand, nine hundred eighty-one".