31303123243 has 4 divisors (see below), whose sum is σ = 35774998000. Its totient is φ = 26831248488.

The previous prime is 31303123207. The next prime is 31303123261. The reversal of 31303123243 is 34232130313.

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-31303123243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31303183243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2235937368 + ... + 2235937381.

It is an arithmetic number, because the mean of its divisors is an integer number (8943749500).

Almost surely, 2^31303123243 is an apocalyptic number.

31303123243 is a deficient number, since it is larger than the sum of its proper divisors (4471874757).

31303123243 is an equidigital number, since it uses as much as digits as its factorization.

31303123243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4471874756.

The product of its (nonzero) digits is 3888, while the sum is 25.

Adding to 31303123243 its reverse (34232130313), we get a palindrome (65535253556).

The spelling of 31303123243 in words is "thirty-one billion, three hundred three million, one hundred twenty-three thousand, two hundred forty-three".