1200001051111 has 2 divisors, whose sum is σ = 1200001051112. Its totient is φ = 1200001051110.

The previous prime is 1200001051097. The next prime is 1200001051163. The reversal of 1200001051111 is 1111501000021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200001051111 - 2²³ = 1199992662503 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200001051091 and 1200001051100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200001021111) 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 as a sum of consecutive naturals, namely, 600000525555 + 600000525556.

It is an arithmetic number, because the mean of its divisors is an integer number (600000525556).

Almost surely, 2^{1200001051111} is an apocalyptic number.

1200001051111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200001051111 is an equidigital number, since it uses as much as digits as its factorization.

1200001051111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 13.

Adding to 1200001051111 its reverse (1111501000021), we get a palindrome (2311502051132).

The spelling of 1200001051111 in words is "one trillion, two hundred billion, one million, fifty-one thousand, one hundred eleven".