13131520243 has 4 divisors (see below), whose sum is σ = 13190406208. Its totient is φ = 13072634280.

The previous prime is 13131520163. The next prime is 13131520271. The reversal of 13131520243 is 34202513131.

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 13131520243 - 2¹⁷ = 13131389171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13131520543) 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, 29442648 + ... + 29443093.

It is an arithmetic number, because the mean of its divisors is an integer number (3297601552).

Almost surely, 2^13131520243 is an apocalyptic number.

13131520243 is a deficient number, since it is larger than the sum of its proper divisors (58885965).

13131520243 is an equidigital number, since it uses as much as digits as its factorization.

13131520243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58885964.

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 13131520243 in words is "thirteen billion, one hundred thirty-one million, five hundred twenty thousand, two hundred forty-three".