111199001891 has 2 divisors, whose sum is σ = 111199001892. Its totient is φ = 111199001890.

The previous prime is 111199001867. The next prime is 111199001897. The reversal of 111199001891 is 198100991111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111199001891 - 2¹⁴ = 111198985507 is a prime.

It is not a weakly prime, because it can be changed into another prime (111199001897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55599500945 + 55599500946.

It is an arithmetic number, because the mean of its divisors is an integer number (55599500946).

Almost surely, 2^111199001891 is an apocalyptic number.

111199001891 is a deficient number, since it is larger than the sum of its proper divisors (1).

111199001891 is an equidigital number, since it uses as much as digits as its factorization.

111199001891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 41.

The spelling of 111199001891 in words is "one hundred eleven billion, one hundred ninety-nine million, one thousand, eight hundred ninety-one".