11309211687 has 4 divisors (see below), whose sum is σ = 15078948920. Its totient is φ = 7539474456.

The previous prime is 11309211679. The next prime is 11309211691. The reversal of 11309211687 is 78611290311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78611290311 = 3 ⋅26203763437.

It is not a de Polignac number, because 11309211687 - 2³ = 11309211679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11309216687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1884868612 + ... + 1884868617.

It is an arithmetic number, because the mean of its divisors is an integer number (3769737230).

Almost surely, 2^11309211687 is an apocalyptic number.

11309211687 is a deficient number, since it is larger than the sum of its proper divisors (3769737233).

11309211687 is an equidigital number, since it uses as much as digits as its factorization.

11309211687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3769737232.

The product of its (nonzero) digits is 18144, while the sum is 39.

The spelling of 11309211687 in words is "eleven billion, three hundred nine million, two hundred eleven thousand, six hundred eighty-seven".