20000100173 has 2 divisors, whose sum is σ = 20000100174. Its totient is φ = 20000100172.

The previous prime is 20000100097. The next prime is 20000100199. The reversal of 20000100173 is 37100100002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17231025289 + 2769074884 = 131267^2 + 52622^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000100173 - 2¹⁰ = 20000099149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20000190173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000050086 + 10000050087.

It is an arithmetic number, because the mean of its divisors is an integer number (10000050087).

Almost surely, 2^20000100173 is an apocalyptic number.

It is an amenable number.

20000100173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000100173 is an equidigital number, since it uses as much as digits as its factorization.

20000100173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 14.

Adding to 20000100173 its reverse (37100100002), we get a palindrome (57100200175).

The spelling of 20000100173 in words is "twenty billion, one hundred thousand, one hundred seventy-three".