11971728979 has 8 divisors (see below), whose sum is σ = 13715431520. Its totient is φ = 10236390336.

The previous prime is 11971728961. The next prime is 11971728997. The reversal of 11971728979 is 97982717911.

It is an interprime number because it is at equal distance from previous prime (11971728961) and next prime (11971728997).

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 11971728979 - 2¹⁷ = 11971597907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11971728929) 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, 2087904 + ... + 2093629.

It is an arithmetic number, because the mean of its divisors is an integer number (1714428940).

Almost surely, 2^11971728979 is an apocalyptic number.

11971728979 is a deficient number, since it is larger than the sum of its proper divisors (1743702541).

11971728979 is an equidigital number, since it uses as much as digits as its factorization.

11971728979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181949.

The product of its digits is 4000752, while the sum is 61.

The spelling of 11971728979 in words is "eleven billion, nine hundred seventy-one million, seven hundred twenty-eight thousand, nine hundred seventy-nine".