11517278309 has 8 divisors (see below), whose sum is σ = 11574995040. Its totient is φ = 11459672496.

The previous prime is 11517278293. The next prime is 11517278329. The reversal of 11517278309 is 90387271511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11517278309 - 2⁴ = 11517278293 is a prime.

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 11517278309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11517278329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184502 + ... + 238904.

It is an arithmetic number, because the mean of its divisors is an integer number (1446874380).

Almost surely, 2^11517278309 is an apocalyptic number.

It is an amenable number.

11517278309 is a deficient number, since it is larger than the sum of its proper divisors (57716731).

11517278309 is an equidigital number, since it uses as much as digits as its factorization.

11517278309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55459.

The product of its (nonzero) digits is 105840, while the sum is 44.

The spelling of 11517278309 in words is "eleven billion, five hundred seventeen million, two hundred seventy-eight thousand, three hundred nine".