626320421 has 2 divisors, whose sum is σ = 626320422. Its totient is φ = 626320420.

The previous prime is 626320417. The next prime is 626320447. The reversal of 626320421 is 124023626.

It is an a-pointer prime, because the next prime (626320447) can be obtained adding 626320421 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437395396 + 188925025 = 20914^2 + 13745^2 .

It is a cyclic number.

It is not a de Polignac number, because 626320421 - 2² = 626320417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (626320411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313160210 + 313160211.

It is an arithmetic number, because the mean of its divisors is an integer number (313160211).

Almost surely, 2^626320421 is an apocalyptic number.

It is an amenable number.

626320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

626320421 is an equidigital number, since it uses as much as digits as its factorization.

626320421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 626320421 is about 25026.3944866215. The cubic root of 626320421 is about 855.5896533258.

The spelling of 626320421 in words is "six hundred twenty-six million, three hundred twenty thousand, four hundred twenty-one".