1200542111 has 2 divisors, whose sum is σ = 1200542112. Its totient is φ = 1200542110.

The previous prime is 1200542059. The next prime is 1200542117. The reversal of 1200542111 is 1112450021.

It is a strong prime.

It is an emirp because it is prime and its reverse (1112450021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200542111 - 2⁶ = 1200542047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200542111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200542117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600271055 + 600271056.

It is an arithmetic number, because the mean of its divisors is an integer number (600271056).

Almost surely, 2^1200542111 is an apocalyptic number.

1200542111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200542111 is an equidigital number, since it uses as much as digits as its factorization.

1200542111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1200542111 is about 34648.8399661518. The cubic root of 1200542111 is about 1062.8185670081.

Adding to 1200542111 its reverse (1112450021), we get a palindrome (2312992132).

The spelling of 1200542111 in words is "one billion, two hundred million, five hundred forty-two thousand, one hundred eleven".