13634389891 has 2 divisors, whose sum is σ = 13634389892. Its totient is φ = 13634389890.

The previous prime is 13634389877. The next prime is 13634389907. The reversal of 13634389891 is 19898343631.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13634389891 is a prime.

It is not a weakly prime, because it can be changed into another prime (13634389801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6817194945 + 6817194946.

It is an arithmetic number, because the mean of its divisors is an integer number (6817194946).

Almost surely, 2^13634389891 is an apocalyptic number.

13634389891 is a deficient number, since it is larger than the sum of its proper divisors (1).

13634389891 is an equidigital number, since it uses as much as digits as its factorization.

13634389891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 55.

The spelling of 13634389891 in words is "thirteen billion, six hundred thirty-four million, three hundred eighty-nine thousand, eight hundred ninety-one".