13520243813 has 2 divisors, whose sum is σ = 13520243814. Its totient is φ = 13520243812.

The previous prime is 13520243791. The next prime is 13520243887. The reversal of 13520243813 is 31834202531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12008433889 + 1511809924 = 109583^2 + 38882^2 .

It is a cyclic number.

It is not a de Polignac number, because 13520243813 - 2¹⁴ = 13520227429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13520243813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13520246813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760121906 + 6760121907.

It is an arithmetic number, because the mean of its divisors is an integer number (6760121907).

Almost surely, 2^13520243813 is an apocalyptic number.

It is an amenable number.

13520243813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13520243813 is an equidigital number, since it uses as much as digits as its factorization.

13520243813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 13520243813 in words is "thirteen billion, five hundred twenty million, two hundred forty-three thousand, eight hundred thirteen".