11911191789 has 32 divisors (see below), whose sum is σ = 19147770880. Its totient is φ = 6433955712.

The previous prime is 11911191767. The next prime is 11911191791. The reversal of 11911191789 is 98719111911.

It is a happy number.

It is not a de Polignac number, because 11911191789 - 2⁹ = 11911191277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11911191749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149682 + ... + 215004.

It is an arithmetic number, because the mean of its divisors is an integer number (598367840).

Almost surely, 2^11911191789 is an apocalyptic number.

11911191789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11911191789 is a deficient number, since it is larger than the sum of its proper divisors (7236579091).

11911191789 is a wasteful number, since it uses less digits than its factorization.

11911191789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65809.

The product of its digits is 40824, while the sum is 48.

The spelling of 11911191789 in words is "eleven billion, nine hundred eleven million, one hundred ninety-one thousand, seven hundred eighty-nine".