13530569 has 4 divisors (see below), whose sum is σ = 14571396. Its totient is φ = 12489744.

The previous prime is 13530563. The next prime is 13530599. The reversal of 13530569 is 96503531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96503531 = 3137 ⋅30763.

It can be written as a sum of positive squares in 2 ways, for example, as 8526400 + 5004169 = 2920^2 + 2237^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13530569 is a prime.

It is a super-4 number, since 4×13530569⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13530563) 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, 520394 + ... + 520419.

It is an arithmetic number, because the mean of its divisors is an integer number (3642849).

Almost surely, 2^13530569 is an apocalyptic number.

It is an amenable number.

13530569 is a deficient number, since it is larger than the sum of its proper divisors (1040827).

13530569 is a wasteful number, since it uses less digits than its factorization.

13530569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040826.

The product of its (nonzero) digits is 12150, while the sum is 32.

The square root of 13530569 is about 3678.3921759377. The cubic root of 13530569 is about 238.2897455077.

The spelling of 13530569 in words is "thirteen million, five hundred thirty thousand, five hundred sixty-nine".