626420321 has 2 divisors, whose sum is σ = 626420322. Its totient is φ = 626420320.

The previous prime is 626420297. The next prime is 626420351. The reversal of 626420321 is 123024626.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 398561296 + 227859025 = 19964^2 + 15095^2 .

It is a cyclic number.

It is not a de Polignac number, because 626420321 - 2²⁶ = 559311457 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 (626420351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313210160 + 313210161.

It is an arithmetic number, because the mean of its divisors is an integer number (313210161).

Almost surely, 2^626420321 is an apocalyptic number.

It is an amenable number.

626420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

626420321 is an equidigital number, since it uses as much as digits as its factorization.

626420321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 626420321 is about 25028.3902998175. The cubic root of 626420321 is about 855.6351406192.

Adding to 626420321 its reverse (123024626), we get a palindrome (749444947).

The spelling of 626420321 in words is "six hundred twenty-six million, four hundred twenty thousand, three hundred twenty-one".