31223212444331 has 2 divisors, whose sum is σ = 31223212444332. Its totient is φ = 31223212444330.

The previous prime is 31223212444327. The next prime is 31223212444351. The reversal of 31223212444331 is 13344421232213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31223212444331 - 2² = 31223212444327 is a prime.

It is a super-2 number, since 2×31223212444331² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31223212444291 and 31223212444300.

It is not a weakly prime, because it can be changed into another prime (31223212444321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15611606222165 + 15611606222166.

It is an arithmetic number, because the mean of its divisors is an integer number (15611606222166).

Almost surely, 2^{31223212444331} is an apocalyptic number.

31223212444331 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223212444331 is an equidigital number, since it uses as much as digits as its factorization.

31223212444331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 35.

Adding to 31223212444331 its reverse (13344421232213), we get a palindrome (44567633676544).

The spelling of 31223212444331 in words is "thirty-one trillion, two hundred twenty-three billion, two hundred twelve million, four hundred forty-four thousand, three hundred thirty-one".