428827561 has 2 divisors, whose sum is σ = 428827562. Its totient is φ = 428827560.

The previous prime is 428827559. The next prime is 428827573. The reversal of 428827561 is 165728824.

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., 428490000 + 337561 = 20700^2 + 581^2 .

It is a cyclic number.

It is not a de Polignac number, because 428827561 - 2¹ = 428827559 is a prime.

Together with 428827559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (428827501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214413780 + 214413781.

It is an arithmetic number, because the mean of its divisors is an integer number (214413781).

Almost surely, 2^428827561 is an apocalyptic number.

It is an amenable number.

428827561 is a deficient number, since it is larger than the sum of its proper divisors (1).

428827561 is an equidigital number, since it uses as much as digits as its factorization.

428827561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 43.

The square root of 428827561 is about 20708.1520421307. The cubic root of 428827561 is about 754.0976081870.

The spelling of 428827561 in words is "four hundred twenty-eight million, eight hundred twenty-seven thousand, five hundred sixty-one".