111211200161 has 2 divisors, whose sum is σ = 111211200162. Its totient is φ = 111211200160.

The previous prime is 111211200157. The next prime is 111211200167. The reversal of 111211200161 is 161002112111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107662734400 + 3548465761 = 328120^2 + 59569^2 .

It is an emirp because it is prime and its reverse (161002112111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111211200161 - 2² = 111211200157 is a prime.

It is not a weakly prime, because it can be changed into another prime (111211200167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605600080 + 55605600081.

It is an arithmetic number, because the mean of its divisors is an integer number (55605600081).

Almost surely, 2^111211200161 is an apocalyptic number.

It is an amenable number.

111211200161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211200161 is an equidigital number, since it uses as much as digits as its factorization.

111211200161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 111211200161 its reverse (161002112111), we get a palindrome (272213312272).

The spelling of 111211200161 in words is "one hundred eleven billion, two hundred eleven million, two hundred thousand, one hundred sixty-one".