312312221131 has 2 divisors, whose sum is σ = 312312221132. Its totient is φ = 312312221130.

The previous prime is 312312221119. The next prime is 312312221147. The reversal of 312312221131 is 131122213213.

It is a weak prime.

It is an emirp because it is prime and its reverse (131122213213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312312221131 - 2¹⁹ = 312311696843 is a prime.

It is a super-2 number, since 2×312312221131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312312221531) 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, 156156110565 + 156156110566.

It is an arithmetic number, because the mean of its divisors is an integer number (156156110566).

Almost surely, 2^312312221131 is an apocalyptic number.

312312221131 is a deficient number, since it is larger than the sum of its proper divisors (1).

312312221131 is an equidigital number, since it uses as much as digits as its factorization.

312312221131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

Adding to 312312221131 its reverse (131122213213), we get a palindrome (443434434344).

The spelling of 312312221131 in words is "three hundred twelve billion, three hundred twelve million, two hundred twenty-one thousand, one hundred thirty-one".