11538939787 has 2 divisors, whose sum is σ = 11538939788. Its totient is φ = 11538939786.

The previous prime is 11538939773. The next prime is 11538939817. The reversal of 11538939787 is 78793983511.

It is a weak prime.

It is an emirp because it is prime and its reverse (78793983511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11538939787 is a prime.

It is not a weakly prime, because it can be changed into another prime (11538939757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5769469893 + 5769469894.

It is an arithmetic number, because the mean of its divisors is an integer number (5769469894).

Almost surely, 2^11538939787 is an apocalyptic number.

11538939787 is a deficient number, since it is larger than the sum of its proper divisors (1).

11538939787 is an equidigital number, since it uses as much as digits as its factorization.

11538939787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 61.

The spelling of 11538939787 in words is "eleven billion, five hundred thirty-eight million, nine hundred thirty-nine thousand, seven hundred eighty-seven".