13634521247 has 4 divisors (see below), whose sum is σ = 13634811960. Its totient is φ = 13634230536.

The previous prime is 13634521223. The next prime is 13634521253. The reversal of 13634521247 is 74212543631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13634521247 - 2¹⁸ = 13634259103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13634521247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13634521207) 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, 57173 + ... + 174750.

It is an arithmetic number, because the mean of its divisors is an integer number (3408702990).

Almost surely, 2^13634521247 is an apocalyptic number.

13634521247 is a deficient number, since it is larger than the sum of its proper divisors (290713).

13634521247 is an equidigital number, since it uses as much as digits as its factorization.

13634521247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290712.

The product of its digits is 120960, while the sum is 38.

The spelling of 13634521247 in words is "thirteen billion, six hundred thirty-four million, five hundred twenty-one thousand, two hundred forty-seven".