428440390601 has 2 divisors, whose sum is σ = 428440390602. Its totient is φ = 428440390600.

The previous prime is 428440390537. The next prime is 428440390603. The reversal of 428440390601 is 106093044824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393349734976 + 35090655625 = 627176^2 + 187325^2 .

It is a cyclic number.

It is not a de Polignac number, because 428440390601 - 2⁶ = 428440390537 is a prime.

It is a super-2 number, since 2×428440390601² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 428440390603, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (428440390603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214220195300 + 214220195301.

It is an arithmetic number, because the mean of its divisors is an integer number (214220195301).

Almost surely, 2^428440390601 is an apocalyptic number.

It is an amenable number.

428440390601 is a deficient number, since it is larger than the sum of its proper divisors (1).

428440390601 is an equidigital number, since it uses as much as digits as its factorization.

428440390601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 428440390601 in words is "four hundred twenty-eight billion, four hundred forty million, three hundred ninety thousand, six hundred one".