617721323 has 2 divisors, whose sum is σ = 617721324. Its totient is φ = 617721322.

The previous prime is 617721287. The next prime is 617721343. The reversal of 617721323 is 323127716.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 617721323 - 2⁶ = 617721259 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 617721323.

It is not a weakly prime, because it can be changed into another prime (617721343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308860661 + 308860662.

It is an arithmetic number, because the mean of its divisors is an integer number (308860662).

Almost surely, 2^617721323 is an apocalyptic number.

617721323 is a deficient number, since it is larger than the sum of its proper divisors (1).

617721323 is an equidigital number, since it uses as much as digits as its factorization.

617721323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 32.

The square root of 617721323 is about 24854.0001408224. Note that the first 3 decimals coincide. The cubic root of 617721323 is about 851.6559749544.

The spelling of 617721323 in words is "six hundred seventeen million, seven hundred twenty-one thousand, three hundred twenty-three".