31357706643073 has 2 divisors, whose sum is σ = 31357706643074. Its totient is φ = 31357706643072.

The previous prime is 31357706643007. The next prime is 31357706643079. The reversal of 31357706643073 is 37034660775313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24826472168689 + 6531234474384 = 4982617^2 + 2555628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31357706643073 is a prime.

It is not a weakly prime, because it can be changed into another prime (31357706643079) 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, 15678853321536 + 15678853321537.

It is an arithmetic number, because the mean of its divisors is an integer number (15678853321537).

Almost surely, 2^{31357706643073} is an apocalyptic number.

It is an amenable number.

31357706643073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31357706643073 is an equidigital number, since it uses as much as digits as its factorization.

31357706643073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20003760, while the sum is 55.

The spelling of 31357706643073 in words is "thirty-one trillion, three hundred fifty-seven billion, seven hundred six million, six hundred forty-three thousand, seventy-three".