521503342315243 has 4 divisors (see below), whose sum is σ = 535598027242720. Its totient is φ = 507408657387768.

The previous prime is 521503342315139. The next prime is 521503342315253. The reversal of 521503342315243 is 342513243305125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521503342315243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521503342315243.

It is not an unprimeable number, because it can be changed into a prime (521503342315253) 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, 7047342463683 + ... + 7047342463756.

It is an arithmetic number, because the mean of its divisors is an integer number (133899506810680).

Almost surely, 2^{521503342315243} is an apocalyptic number.

521503342315243 is a deficient number, since it is larger than the sum of its proper divisors (14094684927477).

521503342315243 is a wasteful number, since it uses less digits than its factorization.

521503342315243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14094684927476.

The product of its (nonzero) digits is 1296000, while the sum is 43.

The spelling of 521503342315243 in words is "five hundred twenty-one trillion, five hundred three billion, three hundred forty-two million, three hundred fifteen thousand, two hundred forty-three".