13530520819 has 4 divisors (see below), whose sum is σ = 13608732096. Its totient is φ = 13452309544.

The previous prime is 13530520789. The next prime is 13530520831. The reversal of 13530520819 is 91802503531.

It is a happy number.

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 13530520819 - 2²⁷ = 13396303091 is a prime.

It is a super-2 number, since 2×13530520819² (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 (13530520849) 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, 39105379 + ... + 39105724.

It is an arithmetic number, because the mean of its divisors is an integer number (3402183024).

Almost surely, 2^13530520819 is an apocalyptic number.

13530520819 is a deficient number, since it is larger than the sum of its proper divisors (78211277).

13530520819 is an equidigital number, since it uses as much as digits as its factorization.

13530520819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78211276.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 13530520819 in words is "thirteen billion, five hundred thirty million, five hundred twenty thousand, eight hundred nineteen".