628103301821 has 2 divisors, whose sum is σ = 628103301822. Its totient is φ = 628103301820.

The previous prime is 628103301803. The next prime is 628103301841. The reversal of 628103301821 is 128103301826.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 354249945721 + 273853356100 = 595189^2 + 523310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628103301821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628103301841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314051650910 + 314051650911.

It is an arithmetic number, because the mean of its divisors is an integer number (314051650911).

Almost surely, 2^628103301821 is an apocalyptic number.

It is an amenable number.

628103301821 is a deficient number, since it is larger than the sum of its proper divisors (1).

628103301821 is an equidigital number, since it uses as much as digits as its factorization.

628103301821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 628103301821 in words is "six hundred twenty-eight billion, one hundred three million, three hundred one thousand, eight hundred twenty-one".