312221231113031 has 2 divisors, whose sum is σ = 312221231113032. Its totient is φ = 312221231113030.

The previous prime is 312221231113013. The next prime is 312221231113061. The reversal of 312221231113031 is 130311132122213.

Together with previous prime (312221231113013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312221231113031 is a prime.

It is a super-2 number, since 2×312221231113031² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312221231113061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156110615556515 + 156110615556516.

It is an arithmetic number, because the mean of its divisors is an integer number (156110615556516).

Almost surely, 2^{312221231113031} is an apocalyptic number.

312221231113031 is a deficient number, since it is larger than the sum of its proper divisors (1).

312221231113031 is an equidigital number, since it uses as much as digits as its factorization.

312221231113031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 312221231113031 its reverse (130311132122213), we get a palindrome (442532363235244).

The spelling of 312221231113031 in words is "three hundred twelve trillion, two hundred twenty-one billion, two hundred thirty-one million, one hundred thirteen thousand, thirty-one".