617798123 has 2 divisors, whose sum is σ = 617798124. Its totient is φ = 617798122.

The previous prime is 617798117. The next prime is 617798143. The reversal of 617798123 is 321897716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 617798123 - 2⁶ = 617798059 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (617798143) 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, 308899061 + 308899062.

It is an arithmetic number, because the mean of its divisors is an integer number (308899062).

Almost surely, 2^617798123 is an apocalyptic number.

617798123 is a deficient number, since it is larger than the sum of its proper divisors (1).

617798123 is an equidigital number, since it uses as much as digits as its factorization.

617798123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 617798123 is about 24855.5451157282. The cubic root of 617798123 is about 851.6912683604.

The spelling of 617798123 in words is "six hundred seventeen million, seven hundred ninety-eight thousand, one hundred twenty-three".