428771009 has 2 divisors, whose sum is σ = 428771010. Its totient is φ = 428771008.

The previous prime is 428770987. The next prime is 428771023. The reversal of 428771009 is 900177824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428697025 + 73984 = 20705^2 + 272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428771009 is a prime.

It is not a weakly prime, because it can be changed into another prime (428771069) 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, 214385504 + 214385505.

It is an arithmetic number, because the mean of its divisors is an integer number (214385505).

Almost surely, 2^428771009 is an apocalyptic number.

It is an amenable number.

428771009 is a deficient number, since it is larger than the sum of its proper divisors (1).

428771009 is an equidigital number, since it uses as much as digits as its factorization.

428771009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 428771009 is about 20706.7865445124. The cubic root of 428771009 is about 754.0644576415.

The spelling of 428771009 in words is "four hundred twenty-eight million, seven hundred seventy-one thousand, nine".