111111111209899 has 2 divisors, whose sum is σ = 111111111209900. Its totient is φ = 111111111209898.

The previous prime is 111111111209867. The next prime is 111111111209977. The reversal of 111111111209899 is 998902111111111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 111111111209899 - 2⁵ = 111111111209867 is a prime.

It is not a weakly prime, because it can be changed into another prime (111111111203899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55555555604949 + 55555555604950.

It is an arithmetic number, because the mean of its divisors is an integer number (55555555604950).

Almost surely, 2^{111111111209899} is an apocalyptic number.

111111111209899 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111111209899 is an equidigital number, since it uses as much as digits as its factorization.

111111111209899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 46.

The spelling of 111111111209899 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred eleven million, two hundred nine thousand, eight hundred ninety-nine".