31320111202243 has 4 divisors (see below), whose sum is σ = 31320159548328. Its totient is φ = 31320062856160.

The previous prime is 31320111202207. The next prime is 31320111202283. The reversal of 31320111202243 is 34220211102313.

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-31320111202243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31320111202283) 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, 23187913 + ... + 24501418.

It is an arithmetic number, because the mean of its divisors is an integer number (7830039887082).

Almost surely, 2^{31320111202243} is an apocalyptic number.

31320111202243 is a deficient number, since it is larger than the sum of its proper divisors (48346085).

31320111202243 is an equidigital number, since it uses as much as digits as its factorization.

31320111202243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48346084.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 31320111202243 its reverse (34220211102313), we get a palindrome (65540322304556).

The spelling of 31320111202243 in words is "thirty-one trillion, three hundred twenty billion, one hundred eleven million, two hundred two thousand, two hundred forty-three".