11287816939 has 6 divisors (see below), whose sum is σ = 13130725884. Its totient is φ = 9675271620.

The previous prime is 11287816901. The next prime is 11287816979. The reversal of 11287816939 is 93961878211.

It is a happy number.

It is not a de Polignac number, because 11287816939 - 2⁹ = 11287816427 is a prime.

It is a super-2 number, since 2×11287816939² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11287816939.

It is not an unprimeable number, because it can be changed into a prime (11287816979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115181757 + ... + 115181854.

It is an arithmetic number, because the mean of its divisors is an integer number (2188454314).

Almost surely, 2^11287816939 is an apocalyptic number.

11287816939 is a deficient number, since it is larger than the sum of its proper divisors (1842908945).

11287816939 is an equidigital number, since it uses as much as digits as its factorization.

11287816939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230363625 (or 230363618 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 55.

The spelling of 11287816939 in words is "eleven billion, two hundred eighty-seven million, eight hundred sixteen thousand, nine hundred thirty-nine".