617919308129 has 2 divisors, whose sum is σ = 617919308130. Its totient is φ = 617919308128.

The previous prime is 617919308119. The next prime is 617919308141. The reversal of 617919308129 is 921803919716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595821891025 + 22097417104 = 771895^2 + 148652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-617919308129 is a prime.

It is not a weakly prime, because it can be changed into another prime (617919308119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308959654064 + 308959654065.

It is an arithmetic number, because the mean of its divisors is an integer number (308959654065).

Almost surely, 2^617919308129 is an apocalyptic number.

It is an amenable number.

617919308129 is a deficient number, since it is larger than the sum of its proper divisors (1).

617919308129 is an equidigital number, since it uses as much as digits as its factorization.

617919308129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 56.

The spelling of 617919308129 in words is "six hundred seventeen billion, nine hundred nineteen million, three hundred eight thousand, one hundred twenty-nine".