11138750981 has 2 divisors, whose sum is σ = 11138750982. Its totient is φ = 11138750980.

The previous prime is 11138750941. The next prime is 11138750993. The reversal of 11138750981 is 18905783111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5664970756 + 5473780225 = 75266^2 + 73985^2 .

It is an emirp because it is prime and its reverse (18905783111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11138750981 - 2²⁶ = 11071642117 is a prime.

It is a super-2 number, since 2×11138750981² (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 (11138750941) 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, 5569375490 + 5569375491.

It is an arithmetic number, because the mean of its divisors is an integer number (5569375491).

Almost surely, 2^11138750981 is an apocalyptic number.

It is an amenable number.

11138750981 is a deficient number, since it is larger than the sum of its proper divisors (1).

11138750981 is an equidigital number, since it uses as much as digits as its factorization.

11138750981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 44.

The spelling of 11138750981 in words is "eleven billion, one hundred thirty-eight million, seven hundred fifty thousand, nine hundred eighty-one".