11111241989 has 2 divisors, whose sum is σ = 11111241990. Its totient is φ = 11111241988.

The previous prime is 11111241943. The next prime is 11111242001. The reversal of 11111241989 is 98914211111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8387445889 + 2723796100 = 91583^2 + 52190^2 .

It is an emirp because it is prime and its reverse (98914211111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111241989 - 2⁸ = 11111241733 is a prime.

It is a super-2 number, since 2×11111241989² (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 (11111261989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555620994 + 5555620995.

It is an arithmetic number, because the mean of its divisors is an integer number (5555620995).

Almost surely, 2^11111241989 is an apocalyptic number.

It is an amenable number.

11111241989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111241989 is an equidigital number, since it uses as much as digits as its factorization.

11111241989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 38.

The spelling of 11111241989 in words is "eleven billion, one hundred eleven million, two hundred forty-one thousand, nine hundred eighty-nine".