617648771 has 2 divisors, whose sum is σ = 617648772. Its totient is φ = 617648770.

The previous prime is 617648767. The next prime is 617648791. The reversal of 617648771 is 177846716.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 617648771 - 2² = 617648767 is a prime.

It is not a weakly prime, because it can be changed into another prime (617648701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308824385 + 308824386.

It is an arithmetic number, because the mean of its divisors is an integer number (308824386).

Almost surely, 2^617648771 is an apocalyptic number.

617648771 is a deficient number, since it is larger than the sum of its proper divisors (1).

617648771 is an equidigital number, since it uses as much as digits as its factorization.

617648771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 47.

The square root of 617648771 is about 24852.5405341184. The cubic root of 617648771 is about 851.6226310277.

The spelling of 617648771 in words is "six hundred seventeen million, six hundred forty-eight thousand, seven hundred seventy-one".