111001001161 has 2 divisors, whose sum is σ = 111001001162. Its totient is φ = 111001001160.

The previous prime is 111001001119. The next prime is 111001001171. The reversal of 111001001161 is 161100100111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60125492025 + 50875509136 = 245205^2 + 225556^2 .

It is an emirp because it is prime and its reverse (161100100111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111001001161 - 2¹⁷ = 111000870089 is a prime.

It is not a weakly prime, because it can be changed into another prime (111001001171) 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, 55500500580 + 55500500581.

It is an arithmetic number, because the mean of its divisors is an integer number (55500500581).

Almost surely, 2^111001001161 is an apocalyptic number.

It is an amenable number.

111001001161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111001001161 is an equidigital number, since it uses as much as digits as its factorization.

111001001161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 13.

Adding to 111001001161 its reverse (161100100111), we get a palindrome (272101101272).

The spelling of 111001001161 in words is "one hundred eleven billion, one million, one thousand, one hundred sixty-one".