13011878917 has 2 divisors, whose sum is σ = 13011878918. Its totient is φ = 13011878916.

The previous prime is 13011878879. The next prime is 13011878963. The reversal of 13011878917 is 71987811031.

It is a happy number.

It is an a-pointer prime, because the next prime (13011878963) can be obtained adding 13011878917 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10966487841 + 2045391076 = 104721^2 + 45226^2 .

It is an emirp because it is prime and its reverse (71987811031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13011878917 - 2¹¹ = 13011876869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13011878977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6505939458 + 6505939459.

It is an arithmetic number, because the mean of its divisors is an integer number (6505939459).

Almost surely, 2^13011878917 is an apocalyptic number.

It is an amenable number.

13011878917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13011878917 is an equidigital number, since it uses as much as digits as its factorization.

13011878917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 46.

The spelling of 13011878917 in words is "thirteen billion, eleven million, eight hundred seventy-eight thousand, nine hundred seventeen".