620320553 has 2 divisors, whose sum is σ = 620320554. Its totient is φ = 620320552.

The previous prime is 620320549. The next prime is 620320559. The reversal of 620320553 is 355023026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484528144 + 135792409 = 22012^2 + 11653^2 .

It is a cyclic number.

It is not a de Polignac number, because 620320553 - 2² = 620320549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (620320559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310160276 + 310160277.

It is an arithmetic number, because the mean of its divisors is an integer number (310160277).

Almost surely, 2^620320553 is an apocalyptic number.

It is an amenable number.

620320553 is a deficient number, since it is larger than the sum of its proper divisors (1).

620320553 is an equidigital number, since it uses as much as digits as its factorization.

620320553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 620320553 is about 24906.2352233331. The cubic root of 620320553 is about 852.8488279294.

Adding to 620320553 its reverse (355023026), we get a palindrome (975343579).

The spelling of 620320553 in words is "six hundred twenty million, three hundred twenty thousand, five hundred fifty-three".