13891695109 has 2 divisors, whose sum is σ = 13891695110. Its totient is φ = 13891695108.

The previous prime is 13891695079. The next prime is 13891695137. The reversal of 13891695109 is 90159619831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11226038209 + 2665656900 = 105953^2 + 51630^2 .

It is a cyclic number.

It is not a de Polignac number, because 13891695109 - 2¹⁵ = 13891662341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13891696109) 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, 6945847554 + 6945847555.

It is an arithmetic number, because the mean of its divisors is an integer number (6945847555).

Almost surely, 2^13891695109 is an apocalyptic number.

It is an amenable number.

13891695109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891695109 is an equidigital number, since it uses as much as digits as its factorization.

13891695109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 52.

The spelling of 13891695109 in words is "thirteen billion, eight hundred ninety-one million, six hundred ninety-five thousand, one hundred nine".