13279771217 has 4 divisors (see below), whose sum is σ = 13280152116. Its totient is φ = 13279390320.

The previous prime is 13279771189. The next prime is 13279771229. The reversal of 13279771217 is 71217797231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2695271056 + 10584500161 = 51916^2 + 102881^2 .

It is a cyclic number.

It is not a de Polignac number, because 13279771217 - 2¹⁰ = 13279770193 is a prime.

It is a super-2 number, since 2×13279771217² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13279771237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132218 + ... + 209859.

It is an arithmetic number, because the mean of its divisors is an integer number (3320038029).

Almost surely, 2^13279771217 is an apocalyptic number.

It is an amenable number.

13279771217 is a deficient number, since it is larger than the sum of its proper divisors (380899).

13279771217 is an equidigital number, since it uses as much as digits as its factorization.

13279771217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380898.

The product of its digits is 259308, while the sum is 47.

The spelling of 13279771217 in words is "thirteen billion, two hundred seventy-nine million, seven hundred seventy-one thousand, two hundred seventeen".