13530135251 has 4 divisors (see below), whose sum is σ = 13550605104. Its totient is φ = 13509665400.

The previous prime is 13530135209. The next prime is 13530135257. The reversal of 13530135251 is 15253103531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15253103531 = 229 ⋅66607439.

It is a cyclic number.

It is not a de Polignac number, because 13530135251 - 2⁶ = 13530135187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13530135257) 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, 10233935 + ... + 10235256.

It is an arithmetic number, because the mean of its divisors is an integer number (3387651276).

Almost surely, 2^13530135251 is an apocalyptic number.

13530135251 is a deficient number, since it is larger than the sum of its proper divisors (20469853).

13530135251 is an equidigital number, since it uses as much as digits as its factorization.

13530135251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20469852.

The product of its (nonzero) digits is 6750, while the sum is 29.

Adding to 13530135251 its reverse (15253103531), we get a palindrome (28783238782).

The spelling of 13530135251 in words is "thirteen billion, five hundred thirty million, one hundred thirty-five thousand, two hundred fifty-one".