617320217 has 2 divisors, whose sum is σ = 617320218. Its totient is φ = 617320216.

The previous prime is 617320211. The next prime is 617320237. The reversal of 617320217 is 712023716.

617320217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 446730496 + 170589721 = 21136^2 + 13061^2 .

It is a cyclic number.

It is not a de Polignac number, because 617320217 - 2⁶ = 617320153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 617320217.

It is not a weakly prime, because it can be changed into another prime (617320211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308660108 + 308660109.

It is an arithmetic number, because the mean of its divisors is an integer number (308660109).

Almost surely, 2^617320217 is an apocalyptic number.

It is an amenable number.

617320217 is a deficient number, since it is larger than the sum of its proper divisors (1).

617320217 is an equidigital number, since it uses as much as digits as its factorization.

617320217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 617320217 is about 24845.9295861515. The cubic root of 617320217 is about 851.4715993179.

The spelling of 617320217 in words is "six hundred seventeen million, three hundred twenty thousand, two hundred seventeen".