31221232986617 has 2 divisors, whose sum is σ = 31221232986618. Its totient is φ = 31221232986616.

The previous prime is 31221232986589. The next prime is 31221232986623. The reversal of 31221232986617 is 71668923212213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29412627602281 + 1808605384336 = 5423341^2 + 1344844^2 .

It is a cyclic number.

It is not a de Polignac number, because 31221232986617 - 2¹² = 31221232982521 is a prime.

It is a super-2 number, since 2×31221232986617² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31221232986017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610616493308 + 15610616493309.

It is an arithmetic number, because the mean of its divisors is an integer number (15610616493309).

Almost surely, 2^{31221232986617} is an apocalyptic number.

It is an amenable number.

31221232986617 is a deficient number, since it is larger than the sum of its proper divisors (1).

31221232986617 is an equidigital number, since it uses as much as digits as its factorization.

31221232986617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The spelling of 31221232986617 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred thirty-two million, nine hundred eighty-six thousand, six hundred seventeen".