109171206173 has 2 divisors, whose sum is σ = 109171206174. Its totient is φ = 109171206172.

The previous prime is 109171206113. The next prime is 109171206211. The reversal of 109171206173 is 371602171901.

It is an a-pointer prime, because the next prime (109171206211) can be obtained adding 109171206173 to its sum of digits (38).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57122434009 + 52048772164 = 239003^2 + 228142^2 .

It is an emirp because it is prime and its reverse (371602171901) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109171206173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109171206103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54585603086 + 54585603087.

It is an arithmetic number, because the mean of its divisors is an integer number (54585603087).

Almost surely, 2^109171206173 is an apocalyptic number.

It is an amenable number.

109171206173 is a deficient number, since it is larger than the sum of its proper divisors (1).

109171206173 is an equidigital number, since it uses as much as digits as its factorization.

109171206173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The spelling of 109171206173 in words is "one hundred nine billion, one hundred seventy-one million, two hundred six thousand, one hundred seventy-three".