111111210173 has 2 divisors, whose sum is σ = 111111210174. Its totient is φ = 111111210172.

The previous prime is 111111210103. The next prime is 111111210181. The reversal of 111111210173 is 371012111111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96061563844 + 15049646329 = 309938^2 + 122677^2 .

It is a cyclic number.

It is not a de Polignac number, because 111111210173 - 2¹⁴ = 111111193789 is a prime.

It is a super-2 number, since 2×111111210173² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111111210103) 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, 55555605086 + 55555605087.

It is an arithmetic number, because the mean of its divisors is an integer number (55555605087).

Almost surely, 2^111111210173 is an apocalyptic number.

It is an amenable number.

111111210173 is a deficient number, since it is larger than the sum of its proper divisors (1).

111111210173 is an equidigital number, since it uses as much as digits as its factorization.

111111210173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42, while the sum is 20.

Adding to 111111210173 its reverse (371012111111), we get a palindrome (482123321284).

The spelling of 111111210173 in words is "one hundred eleven billion, one hundred eleven million, two hundred ten thousand, one hundred seventy-three".