428360521 has 2 divisors, whose sum is σ = 428360522. Its totient is φ = 428360520.

The previous prime is 428360519. The next prime is 428360531. The reversal of 428360521 is 125063824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325622025 + 102738496 = 18045^2 + 10136^2 .

It is a cyclic number.

It is not a de Polignac number, because 428360521 - 2¹ = 428360519 is a prime.

Together with 428360519, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428360501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214180260 + 214180261.

It is an arithmetic number, because the mean of its divisors is an integer number (214180261).

Almost surely, 2^428360521 is an apocalyptic number.

It is an amenable number.

428360521 is a deficient number, since it is larger than the sum of its proper divisors (1).

428360521 is an equidigital number, since it uses as much as digits as its factorization.

428360521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 428360521 is about 20696.8722516229. The cubic root of 428360521 is about 753.8237438839.

The spelling of 428360521 in words is "four hundred twenty-eight million, three hundred sixty thousand, five hundred twenty-one".