13581870509 has 2 divisors, whose sum is σ = 13581870510. Its totient is φ = 13581870508.

The previous prime is 13581870493. The next prime is 13581870539. The reversal of 13581870509 is 90507818531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9011704900 + 4570165609 = 94930^2 + 67603^2 .

It is a cyclic number.

It is not a de Polignac number, because 13581870509 - 2⁴ = 13581870493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13581870539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6790935254 + 6790935255.

It is an arithmetic number, because the mean of its divisors is an integer number (6790935255).

Almost surely, 2^13581870509 is an apocalyptic number.

It is an amenable number.

13581870509 is a deficient number, since it is larger than the sum of its proper divisors (1).

13581870509 is an equidigital number, since it uses as much as digits as its factorization.

13581870509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 47.

The spelling of 13581870509 in words is "thirteen billion, five hundred eighty-one million, eight hundred seventy thousand, five hundred nine".