620321321 has 2 divisors, whose sum is σ = 620321322. Its totient is φ = 620321320.

The previous prime is 620321257. The next prime is 620321323. The reversal of 620321321 is 123123026.

It is a happy number.

620321321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 486687721 + 133633600 = 22061^2 + 11560^2 .

It is a cyclic number.

It is not a de Polignac number, because 620321321 - 2⁶ = 620321257 is a prime.

Together with 620321323, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 620321293 and 620321302.

It is not a weakly prime, because it can be changed into another prime (620321323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310160660 + 310160661.

It is an arithmetic number, because the mean of its divisors is an integer number (310160661).

Almost surely, 2^620321321 is an apocalyptic number.

It is an amenable number.

620321321 is a deficient number, since it is larger than the sum of its proper divisors (1).

620321321 is an equidigital number, since it uses as much as digits as its factorization.

620321321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 620321321 is about 24906.2506411543. The cubic root of 620321321 is about 852.8491798913.

Adding to 620321321 its reverse (123123026), we get a palindrome (743444347).

The spelling of 620321321 in words is "six hundred twenty million, three hundred twenty-one thousand, three hundred twenty-one".