11819680991 has 4 divisors (see below), whose sum is σ = 11820153312. Its totient is φ = 11819208672.

The previous prime is 11819680963. The next prime is 11819680993. The reversal of 11819680991 is 19908691811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19908691811 = 23887 ⋅833453.

It is a cyclic number.

It is not a de Polignac number, because 11819680991 - 2⁶ = 11819680927 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 (11819680993) 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, 196391 + ... + 249416.

It is an arithmetic number, because the mean of its divisors is an integer number (2955038328).

Almost surely, 2^11819680991 is an apocalyptic number.

11819680991 is a deficient number, since it is larger than the sum of its proper divisors (472321).

11819680991 is an equidigital number, since it uses as much as digits as its factorization.

11819680991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472320.

The product of its (nonzero) digits is 279936, while the sum is 53.

The spelling of 11819680991 in words is "eleven billion, eight hundred nineteen million, six hundred eighty thousand, nine hundred ninety-one".