13172891917 has 2 divisors, whose sum is σ = 13172891918. Its totient is φ = 13172891916.

The previous prime is 13172891911. The next prime is 13172891923. The reversal of 13172891917 is 71919827131.

It is a balanced prime because it is at equal distance from previous prime (13172891911) and next prime (13172891923).

It can be written as a sum of positive squares in only one way, i.e., 8009176036 + 5163715881 = 89494^2 + 71859^2 .

It is a cyclic number.

It is not a de Polignac number, because 13172891917 - 2²⁷ = 13038674189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13172891911) 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 as a sum of consecutive naturals, namely, 6586445958 + 6586445959.

It is an arithmetic number, because the mean of its divisors is an integer number (6586445959).

Almost surely, 2^13172891917 is an apocalyptic number.

It is an amenable number.

13172891917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13172891917 is an equidigital number, since it uses as much as digits as its factorization.

13172891917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 49.

The spelling of 13172891917 in words is "thirteen billion, one hundred seventy-two million, eight hundred ninety-one thousand, nine hundred seventeen".