31313440243 has 2 divisors, whose sum is σ = 31313440244. Its totient is φ = 31313440242.

The previous prime is 31313440201. The next prime is 31313440259. The reversal of 31313440243 is 34204431313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313440243 is a prime.

It is not a weakly prime, because it can be changed into another prime (31313440273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656720121 + 15656720122.

It is an arithmetic number, because the mean of its divisors is an integer number (15656720122).

Almost surely, 2^31313440243 is an apocalyptic number.

31313440243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313440243 is an equidigital number, since it uses as much as digits as its factorization.

31313440243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 31313440243 its reverse (34204431313), we get a palindrome (65517871556).

The spelling of 31313440243 in words is "thirty-one billion, three hundred thirteen million, four hundred forty thousand, two hundred forty-three".