31356412794881 has 2 divisors, whose sum is σ = 31356412794882. Its totient is φ = 31356412794880.

The previous prime is 31356412794857. The next prime is 31356412794953. The reversal of 31356412794881 is 18849721465313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29580643338481 + 1775769456400 = 5438809^2 + 1332580^2 .

It is a cyclic number.

It is not a de Polignac number, because 31356412794881 - 2¹⁰ = 31356412793857 is a prime.

It is a super-2 number, since 2×31356412794881² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31356412794281) 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, 15678206397440 + 15678206397441.

It is an arithmetic number, because the mean of its divisors is an integer number (15678206397441).

Almost surely, 2^{31356412794881} is an apocalyptic number.

It is an amenable number.

31356412794881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31356412794881 is an equidigital number, since it uses as much as digits as its factorization.

31356412794881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 62.

The spelling of 31356412794881 in words is "thirty-one trillion, three hundred fifty-six billion, four hundred twelve million, seven hundred ninety-four thousand, eight hundred eighty-one".