31321444243 has 2 divisors, whose sum is σ = 31321444244. Its totient is φ = 31321444242.

The previous prime is 31321444237. The next prime is 31321444247. The reversal of 31321444243 is 34244412313.

It is a strong prime.

It is an emirp because it is prime and its reverse (34244412313) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321444243 is a prime.

It is not a weakly prime, because it can be changed into another prime (31321444247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660722121 + 15660722122.

It is an arithmetic number, because the mean of its divisors is an integer number (15660722122).

Almost surely, 2^31321444243 is an apocalyptic number.

31321444243 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321444243 is an equidigital number, since it uses as much as digits as its factorization.

31321444243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 31.

Adding to 31321444243 its reverse (34244412313), we get a palindrome (65565856556).

The spelling of 31321444243 in words is "thirty-one billion, three hundred twenty-one million, four hundred forty-four thousand, two hundred forty-three".