13530434251 has 4 divisors (see below), whose sum is σ = 13966899904. Its totient is φ = 13093968600.

The previous prime is 13530434233. The next prime is 13530434293. The reversal of 13530434251 is 15243403531.

13530434251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15243403531 = 73 ⋅208813747.

It is a cyclic number.

It is not a de Polignac number, because 13530434251 - 2¹⁹ = 13529909963 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 436465621 = 13530434251 / (1 + 3 + 5 + 3 + 0 + 4 + 3 + 4 + 2 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13530434221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218232780 + ... + 218232841.

It is an arithmetic number, because the mean of its divisors is an integer number (3491724976).

Almost surely, 2^13530434251 is an apocalyptic number.

13530434251 is a deficient number, since it is larger than the sum of its proper divisors (436465653).

13530434251 is an equidigital number, since it uses as much as digits as its factorization.

13530434251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436465652.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 13530434251 its reverse (15243403531), we get a palindrome (28773837782).

The spelling of 13530434251 in words is "thirteen billion, five hundred thirty million, four hundred thirty-four thousand, two hundred fifty-one".