31581129244673 has 2 divisors, whose sum is σ = 31581129244674. Its totient is φ = 31581129244672.

The previous prime is 31581129244657. The next prime is 31581129244699. The reversal of 31581129244673 is 37644292118513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20871630828304 + 10709498416369 = 4568548^2 + 3272537^2 .

It is a cyclic number.

It is not a de Polignac number, because 31581129244673 - 2⁴ = 31581129244657 is a prime.

It is a super-2 number, since 2×31581129244673² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31581129244603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15790564622336 + 15790564622337.

It is an arithmetic number, because the mean of its divisors is an integer number (15790564622337).

Almost surely, 2^{31581129244673} is an apocalyptic number.

It is an amenable number.

31581129244673 is a deficient number, since it is larger than the sum of its proper divisors (1).

31581129244673 is an equidigital number, since it uses as much as digits as its factorization.

31581129244673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 56.

The spelling of 31581129244673 in words is "thirty-one trillion, five hundred eighty-one billion, one hundred twenty-nine million, two hundred forty-four thousand, six hundred seventy-three".