2001111123173 has 2 divisors, whose sum is σ = 2001111123174. Its totient is φ = 2001111123172.

The previous prime is 2001111123161. The next prime is 2001111123247. The reversal of 2001111123173 is 3713211111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1957713067489 + 43398055684 = 1399183^2 + 208322^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001111123173 - 2¹⁶ = 2001111057637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001111323173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000555561586 + 1000555561587.

It is an arithmetic number, because the mean of its divisors is an integer number (1000555561587).

Almost surely, 2^{2001111123173} is an apocalyptic number.

It is an amenable number.

2001111123173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001111123173 is an equidigital number, since it uses as much as digits as its factorization.

2001111123173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

Adding to 2001111123173 its reverse (3713211111002), we get a palindrome (5714322234175).

The spelling of 2001111123173 in words is "two trillion, one billion, one hundred eleven million, one hundred twenty-three thousand, one hundred seventy-three".