1428521 has 2 divisors, whose sum is σ = 1428522. Its totient is φ = 1428520.

The previous prime is 1428491. The next prime is 1428529. The reversal of 1428521 is 1258241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1081600 + 346921 = 1040^2 + 589^2 .

It is an emirp because it is prime and its reverse (1258241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1428521 is a prime.

It is a Chen prime.

It is equal to p₁₀₉₀₉₄ and since 1428521 and 109094 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1428529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714260 + 714261.

It is an arithmetic number, because the mean of its divisors is an integer number (714261).

2^1428521 is an apocalyptic number.

It is an amenable number.

1428521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428521 is an equidigital number, since it uses as much as digits as its factorization.

1428521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

The square root of 1428521 is about 1195.2075133633. The cubic root of 1428521 is about 112.6234628104.

The spelling of 1428521 in words is "one million, four hundred twenty-eight thousand, five hundred twenty-one".