11280127991 has 16 divisors (see below), whose sum is σ = 12513591936. Its totient is φ = 10081500000.

The previous prime is 11280127967. The next prime is 11280128003. The reversal of 11280127991 is 19972108211.

It is not a de Polignac number, because 11280127991 - 2⁶ = 11280127927 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 (11280127961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2178836 + ... + 2184006.

It is an arithmetic number, because the mean of its divisors is an integer number (782099496).

Almost surely, 2^11280127991 is an apocalyptic number.

11280127991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11280127991 is a deficient number, since it is larger than the sum of its proper divisors (1233463945).

11280127991 is a wasteful number, since it uses less digits than its factorization.

11280127991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8494.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 11280127991 in words is "eleven billion, two hundred eighty million, one hundred twenty-seven thousand, nine hundred ninety-one".