1191912041899 has 4 divisors (see below), whose sum is σ = 1193672621664. Its totient is φ = 1190151462136.

The previous prime is 1191912041897. The next prime is 1191912041917. The reversal of 1191912041899 is 9981402191911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1191912041899 - 2¹ = 1191912041897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191912041897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 880288867 + ... + 880290220.

It is an arithmetic number, because the mean of its divisors is an integer number (298418155416).

Almost surely, 2^{1191912041899} is an apocalyptic number.

1191912041899 is a deficient number, since it is larger than the sum of its proper divisors (1760579765).

1191912041899 is an equidigital number, since it uses as much as digits as its factorization.

1191912041899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760579764.

The product of its (nonzero) digits is 419904, while the sum is 55.

The spelling of 1191912041899 in words is "one trillion, one hundred ninety-one billion, nine hundred twelve million, forty-one thousand, eight hundred ninety-nine".