31641813671309 has 2 divisors, whose sum is σ = 31641813671310. Its totient is φ = 31641813671308.

The previous prime is 31641813671287. The next prime is 31641813671333. The reversal of 31641813671309 is 90317631814613.

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., 31635281475625 + 6532195684 = 5624525^2 + 80822^2 .

It is a cyclic number.

It is not a de Polignac number, because 31641813671309 - 2²⁴ = 31641796894093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31641813671359) 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, 15820906835654 + 15820906835655.

It is an arithmetic number, because the mean of its divisors is an integer number (15820906835655).

Almost surely, 2^{31641813671309} is an apocalyptic number.

It is an amenable number.

31641813671309 is a deficient number, since it is larger than the sum of its proper divisors (1).

31641813671309 is an equidigital number, since it uses as much as digits as its factorization.

31641813671309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 31641813671309 in words is "thirty-one trillion, six hundred forty-one billion, eight hundred thirteen million, six hundred seventy-one thousand, three hundred nine".