13681235789 has 4 divisors (see below), whose sum is σ = 14733638556. Its totient is φ = 12628833024.

The previous prime is 13681235767. The next prime is 13681235801. The reversal of 13681235789 is 98753218631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98753218631 = 65707 ⋅1502933.

It can be written as a sum of positive squares in 2 ways, for example, as 8077515625 + 5603720164 = 89875^2 + 74858^2 .

It is a cyclic number.

It is not a de Polignac number, because 13681235789 - 2¹² = 13681231693 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13681235789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13681235989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526201364 + ... + 526201389.

It is an arithmetic number, because the mean of its divisors is an integer number (3683409639).

Almost surely, 2^13681235789 is an apocalyptic number.

It is an amenable number.

13681235789 is a deficient number, since it is larger than the sum of its proper divisors (1052402767).

13681235789 is a wasteful number, since it uses less digits than its factorization.

13681235789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052402766.

The product of its digits is 2177280, while the sum is 53.

The spelling of 13681235789 in words is "thirteen billion, six hundred eighty-one million, two hundred thirty-five thousand, seven hundred eighty-nine".