993503521243 has 4 divisors (see below), whose sum is σ = 997958694208. Its totient is φ = 989048348280.

The previous prime is 993503521189. The next prime is 993503521259. The reversal of 993503521243 is 342125305399.

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-993503521243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 993503521193 and 993503521202.

It is not an unprimeable number, because it can be changed into a prime (993503521643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2227586148 + ... + 2227586593.

It is an arithmetic number, because the mean of its divisors is an integer number (249489673552).

Almost surely, 2^993503521243 is an apocalyptic number.

993503521243 is a deficient number, since it is larger than the sum of its proper divisors (4455172965).

993503521243 is a wasteful number, since it uses less digits than its factorization.

993503521243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4455172964.

The product of its (nonzero) digits is 874800, while the sum is 46.

The spelling of 993503521243 in words is "nine hundred ninety-three billion, five hundred three million, five hundred twenty-one thousand, two hundred forty-three".