1200100111 has 6 divisors (see below), whose sum is σ = 1396034880. Its totient is φ = 1028657196.

The previous prime is 1200100081. The next prime is 1200100129. The reversal of 1200100111 is 1110010021.

It is not a de Polignac number, because 1200100111 - 2¹¹ = 1200098063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200100094 and 1200100103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200100151) 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 5 ways as a sum of consecutive naturals, for example, 12245871 + ... + 12245968.

It is an arithmetic number, because the mean of its divisors is an integer number (232672480).

Almost surely, 2^1200100111 is an apocalyptic number.

1200100111 is a deficient number, since it is larger than the sum of its proper divisors (195934769).

1200100111 is an equidigital number, since it uses as much as digits as its factorization.

1200100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24491853 (or 24491846 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 1200100111 is about 34642.4610990617. The cubic root of 1200100111 is about 1062.6881194198.

Adding to 1200100111 its reverse (1110010021), we get a palindrome (2310110132).

The spelling of 1200100111 in words is "one billion, two hundred million, one hundred thousand, one hundred eleven".