621420617 has 2 divisors, whose sum is σ = 621420618. Its totient is φ = 621420616.

The previous prime is 621420581. The next prime is 621420643. The reversal of 621420617 is 716024126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 464143936 + 157276681 = 21544^2 + 12541^2 .

It is a cyclic number.

It is not a de Polignac number, because 621420617 - 2⁸ = 621420361 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621420617.

It is not a weakly prime, because it can be changed into another prime (621420677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310710308 + 310710309.

It is an arithmetic number, because the mean of its divisors is an integer number (310710309).

Almost surely, 2^621420617 is an apocalyptic number.

It is an amenable number.

621420617 is a deficient number, since it is larger than the sum of its proper divisors (1).

621420617 is an equidigital number, since it uses as much as digits as its factorization.

621420617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 621420617 is about 24928.3095495864. The cubic root of 621420617 is about 853.3526718674.

The spelling of 621420617 in words is "six hundred twenty-one million, four hundred twenty thousand, six hundred seventeen".