13891696109 has 2 divisors, whose sum is σ = 13891696110. Its totient is φ = 13891696108.

The previous prime is 13891696003. The next prime is 13891696127. The reversal of 13891696109 is 90169619831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13455304009 + 436392100 = 115997^2 + 20890^2 .

It is a cyclic number.

It is not a de Polignac number, because 13891696109 - 2¹⁶ = 13891630573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13891696909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945848054 + 6945848055.

It is an arithmetic number, because the mean of its divisors is an integer number (6945848055).

Almost surely, 2^13891696109 is an apocalyptic number.

It is an amenable number.

13891696109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13891696109 is an equidigital number, since it uses as much as digits as its factorization.

13891696109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 53.

The spelling of 13891696109 in words is "thirteen billion, eight hundred ninety-one million, six hundred ninety-six thousand, one hundred nine".