31321072548509 has 2 divisors, whose sum is σ = 31321072548510. Its totient is φ = 31321072548508.

The previous prime is 31321072548449. The next prime is 31321072548533. The reversal of 31321072548509 is 90584527012313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18147642600025 + 13173429948484 = 4260005^2 + 3629522^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321072548509 - 2²⁰ = 31321071499933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321072548109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660536274254 + 15660536274255.

It is an arithmetic number, because the mean of its divisors is an integer number (15660536274255).

Almost surely, 2^{31321072548509} is an apocalyptic number.

It is an amenable number.

31321072548509 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321072548509 is an equidigital number, since it uses as much as digits as its factorization.

31321072548509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 31321072548509 in words is "thirty-one trillion, three hundred twenty-one billion, seventy-two million, five hundred forty-eight thousand, five hundred nine".