31213301313281 has 2 divisors, whose sum is σ = 31213301313282. Its totient is φ = 31213301313280.

The previous prime is 31213301313247. The next prime is 31213301313367. The reversal of 31213301313281 is 18231310331213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23339575521025 + 7873725792256 = 4831105^2 + 2806016^2 .

It is a cyclic number.

It is not a de Polignac number, because 31213301313281 - 2³⁰ = 31212227571457 is a prime.

It is a super-2 number, since 2×31213301313281² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31213301313781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606650656640 + 15606650656641.

It is an arithmetic number, because the mean of its divisors is an integer number (15606650656641).

Almost surely, 2^{31213301313281} is an apocalyptic number.

It is an amenable number.

31213301313281 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213301313281 is an equidigital number, since it uses as much as digits as its factorization.

31213301313281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

Adding to 31213301313281 its reverse (18231310331213), we get a palindrome (49444611644494).

The spelling of 31213301313281 in words is "thirty-one trillion, two hundred thirteen billion, three hundred one million, three hundred thirteen thousand, two hundred eighty-one".