11917505287 has 4 divisors (see below), whose sum is σ = 11923386696. Its totient is φ = 11911623880.

The previous prime is 11917505267. The next prime is 11917505309. The reversal of 11917505287 is 78250571911.

11917505287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11917505287 - 2¹⁵ = 11917472519 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 (11917505267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2937664 + ... + 2941717.

It is an arithmetic number, because the mean of its divisors is an integer number (2980846674).

Almost surely, 2^11917505287 is an apocalyptic number.

11917505287 is a deficient number, since it is larger than the sum of its proper divisors (5881409).

11917505287 is an equidigital number, since it uses as much as digits as its factorization.

11917505287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5881408.

The product of its (nonzero) digits is 176400, while the sum is 46.

The spelling of 11917505287 in words is "eleven billion, nine hundred seventeen million, five hundred five thousand, two hundred eighty-seven".