31223223293 has 2 divisors, whose sum is σ = 31223223294. Its totient is φ = 31223223292.

The previous prime is 31223223289. The next prime is 31223223329. The reversal of 31223223293 is 39232232213.

Together with next prime (31223223329) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25644179044 + 5579044249 = 160138^2 + 74693^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223223293 - 2² = 31223223289 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31223223223) 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 as a sum of consecutive naturals, namely, 15611611646 + 15611611647.

It is an arithmetic number, because the mean of its divisors is an integer number (15611611647).

Almost surely, 2^31223223293 is an apocalyptic number.

It is an amenable number.

31223223293 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223223293 is an equidigital number, since it uses as much as digits as its factorization.

31223223293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 32.

The spelling of 31223223293 in words is "thirty-one billion, two hundred twenty-three million, two hundred twenty-three thousand, two hundred ninety-three".