13187206173 has 4 divisors (see below), whose sum is σ = 17582941568. Its totient is φ = 8791470780.

The previous prime is 13187206169. The next prime is 13187206189. The reversal of 13187206173 is 37160278131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13187206173 - 2² = 13187206169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13187206133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2197867693 + ... + 2197867698.

It is an arithmetic number, because the mean of its divisors is an integer number (4395735392).

Almost surely, 2^13187206173 is an apocalyptic number.

It is an amenable number.

13187206173 is a deficient number, since it is larger than the sum of its proper divisors (4395735395).

13187206173 is an equidigital number, since it uses as much as digits as its factorization.

13187206173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395735394.

The product of its (nonzero) digits is 42336, while the sum is 39.

The spelling of 13187206173 in words is "thirteen billion, one hundred eighty-seven million, two hundred six thousand, one hundred seventy-three".