620849717 has 2 divisors, whose sum is σ = 620849718. Its totient is φ = 620849716.

The previous prime is 620849687. The next prime is 620849753. The reversal of 620849717 is 717948026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 429691441 + 191158276 = 20729^2 + 13826^2 .

It is a cyclic number.

It is not a de Polignac number, because 620849717 - 2⁶ = 620849653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620849797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310424858 + 310424859.

It is an arithmetic number, because the mean of its divisors is an integer number (310424859).

Almost surely, 2^620849717 is an apocalyptic number.

It is an amenable number.

620849717 is a deficient number, since it is larger than the sum of its proper divisors (1).

620849717 is an equidigital number, since it uses as much as digits as its factorization.

620849717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 620849717 is about 24916.8560817773. The cubic root of 620849717 is about 853.0912663642.

The spelling of 620849717 in words is "six hundred twenty million, eight hundred forty-nine thousand, seven hundred seventeen".