428923220309 has 2 divisors, whose sum is σ = 428923220310. Its totient is φ = 428923220308.

The previous prime is 428923220291. The next prime is 428923220311. The reversal of 428923220309 is 903022329824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395854888900 + 33068331409 = 629170^2 + 181847^2 .

It is a cyclic number.

It is not a de Polignac number, because 428923220309 - 2⁸ = 428923220053 is a prime.

Together with 428923220311, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428923220309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428923220009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214461610154 + 214461610155.

It is an arithmetic number, because the mean of its divisors is an integer number (214461610155).

Almost surely, 2^428923220309 is an apocalyptic number.

It is an amenable number.

428923220309 is a deficient number, since it is larger than the sum of its proper divisors (1).

428923220309 is an equidigital number, since it uses as much as digits as its factorization.

428923220309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 428923220309 in words is "four hundred twenty-eight billion, nine hundred twenty-three million, two hundred twenty thousand, three hundred nine".