11861738989 has 2 divisors, whose sum is σ = 11861738990. Its totient is φ = 11861738988.

The previous prime is 11861738939. The next prime is 11861739011. The reversal of 11861738989 is 98983716811.

11861738989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10746846889 + 1114892100 = 103667^2 + 33390^2 .

It is a cyclic number.

It is not a de Polignac number, because 11861738989 - 2¹¹ = 11861736941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11861738939) 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, 5930869494 + 5930869495.

It is an arithmetic number, because the mean of its divisors is an integer number (5930869495).

Almost surely, 2^11861738989 is an apocalyptic number.

It is an amenable number.

11861738989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11861738989 is an equidigital number, since it uses as much as digits as its factorization.

11861738989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 61.

The spelling of 11861738989 in words is "eleven billion, eight hundred sixty-one million, seven hundred thirty-eight thousand, nine hundred eighty-nine".