4528421 has 2 divisors, whose sum is σ = 4528422. Its totient is φ = 4528420.

The previous prime is 4528417. The next prime is 4528429. The reversal of 4528421 is 1248254.

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., 4264225 + 264196 = 2065^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 4528421 - 2² = 4528417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₃₁₇₇₈₀ and since 4528421 and 317780 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4528429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2264210 + 2264211.

It is an arithmetic number, because the mean of its divisors is an integer number (2264211).

Almost surely, 2^4528421 is an apocalyptic number.

It is an amenable number.

4528421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4528421 is an equidigital number, since it uses as much as digits as its factorization.

4528421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 26.

The square root of 4528421 is about 2128.0086935913. The cubic root of 4528421 is about 165.4432039208.

The spelling of 4528421 in words is "four million, five hundred twenty-eight thousand, four hundred twenty-one".