11139778987 has 2 divisors, whose sum is σ = 11139778988. Its totient is φ = 11139778986.

The previous prime is 11139778981. The next prime is 11139778997. The reversal of 11139778987 is 78987793111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11139778987 - 2¹¹ = 11139776939 is a prime.

It is not a weakly prime, because it can be changed into another prime (11139778981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5569889493 + 5569889494.

It is an arithmetic number, because the mean of its divisors is an integer number (5569889494).

Almost surely, 2^11139778987 is an apocalyptic number.

11139778987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11139778987 is an equidigital number, since it uses as much as digits as its factorization.

11139778987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5334336, while the sum is 61.

The spelling of 11139778987 in words is "eleven billion, one hundred thirty-nine million, seven hundred seventy-eight thousand, nine hundred eighty-seven".