13530512251 has 4 divisors (see below), whose sum is σ = 13534970512. Its totient is φ = 13526053992.

The previous prime is 13530512227. The next prime is 13530512257. The reversal of 13530512251 is 15221503531.

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 13530512251 - 2¹³ = 13530504059 is a prime.

It is a super-2 number, since 2×13530512251² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13530512257) 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, 2224575 + ... + 2230648.

It is an arithmetic number, because the mean of its divisors is an integer number (3383742628).

Almost surely, 2^13530512251 is an apocalyptic number.

13530512251 is a deficient number, since it is larger than the sum of its proper divisors (4458261).

13530512251 is an equidigital number, since it uses as much as digits as its factorization.

13530512251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458260.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 13530512251 in words is "thirteen billion, five hundred thirty million, five hundred twelve thousand, two hundred fifty-one".