321780492193 has 2 divisors, whose sum is σ = 321780492194. Its totient is φ = 321780492192.

The previous prime is 321780492161. The next prime is 321780492203. The reversal of 321780492193 is 391294087123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192376977664 + 129403514529 = 438608^2 + 359727^2 .

It is a cyclic number.

It is not a de Polignac number, because 321780492193 - 2⁵ = 321780492161 is a prime.

It is not a weakly prime, because it can be changed into another prime (321780492113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160890246096 + 160890246097.

It is an arithmetic number, because the mean of its divisors is an integer number (160890246097).

Almost surely, 2^321780492193 is an apocalyptic number.

It is an amenable number.

321780492193 is a deficient number, since it is larger than the sum of its proper divisors (1).

321780492193 is an equidigital number, since it uses as much as digits as its factorization.

321780492193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 321780492193 in words is "three hundred twenty-one billion, seven hundred eighty million, four hundred ninety-two thousand, one hundred ninety-three".