31223212444351 has 2 divisors, whose sum is σ = 31223212444352. Its totient is φ = 31223212444350.

The previous prime is 31223212444331. The next prime is 31223212444379. The reversal of 31223212444351 is 15344421232213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31223212444351 - 2⁴³ = 22427119422143 is a prime.

It is a super-2 number, since 2×31223212444351² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31223212444351.

It is a congruent number.

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, 15611606222175 + 15611606222176.

It is an arithmetic number, because the mean of its divisors is an integer number (15611606222176).

Almost surely, 2^{31223212444351} is an apocalyptic number.

31223212444351 is a deficient number, since it is larger than the sum of its proper divisors (1).

31223212444351 is an equidigital number, since it uses as much as digits as its factorization.

31223212444351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 37.

Adding to 31223212444351 its reverse (15344421232213), we get a palindrome (46567633676564).

The spelling of 31223212444351 in words is "thirty-one trillion, two hundred twenty-three billion, two hundred twelve million, four hundred forty-four thousand, three hundred fifty-one".