13217870173 has 2 divisors, whose sum is σ = 13217870174. Its totient is φ = 13217870172.

The previous prime is 13217870143. The next prime is 13217870251. The reversal of 13217870173 is 37107871231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12018079129 + 1199791044 = 109627^2 + 34638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13217870173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13217870143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6608935086 + 6608935087.

It is an arithmetic number, because the mean of its divisors is an integer number (6608935087).

Almost surely, 2^13217870173 is an apocalyptic number.

It is an amenable number.

13217870173 is a deficient number, since it is larger than the sum of its proper divisors (1).

13217870173 is an equidigital number, since it uses as much as digits as its factorization.

13217870173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 13217870173 in words is "thirteen billion, two hundred seventeen million, eight hundred seventy thousand, one hundred seventy-three".