321240531617 has 2 divisors, whose sum is σ = 321240531618. Its totient is φ = 321240531616.

The previous prime is 321240531593. The next prime is 321240531649. The reversal of 321240531617 is 716135042123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294410419216 + 26830112401 = 542596^2 + 163799^2 .

It is a cyclic number.

It is not a de Polignac number, because 321240531617 - 2⁸ = 321240531361 is a prime.

It is not a weakly prime, because it can be changed into another prime (321240531317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160620265808 + 160620265809.

It is an arithmetic number, because the mean of its divisors is an integer number (160620265809).

Almost surely, 2^321240531617 is an apocalyptic number.

It is an amenable number.

321240531617 is a deficient number, since it is larger than the sum of its proper divisors (1).

321240531617 is an equidigital number, since it uses as much as digits as its factorization.

321240531617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 321240531617 in words is "three hundred twenty-one billion, two hundred forty million, five hundred thirty-one thousand, six hundred seventeen".