428541649 has 2 divisors, whose sum is σ = 428541650. Its totient is φ = 428541648.

The previous prime is 428541643. The next prime is 428541679. The reversal of 428541649 is 946145824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423042624 + 5499025 = 20568^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 428541649 - 2⁷ = 428541521 is a prime.

It is not a weakly prime, because it can be changed into another prime (428541643) 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, 214270824 + 214270825.

It is an arithmetic number, because the mean of its divisors is an integer number (214270825).

Almost surely, 2^428541649 is an apocalyptic number.

It is an amenable number.

428541649 is a deficient number, since it is larger than the sum of its proper divisors (1).

428541649 is an equidigital number, since it uses as much as digits as its factorization.

428541649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 43.

The square root of 428541649 is about 20701.2475227944. The cubic root of 428541649 is about 753.9299778778.

The spelling of 428541649 in words is "four hundred twenty-eight million, five hundred forty-one thousand, six hundred forty-nine".