4026521 has 2 divisors, whose sum is σ = 4026522. Its totient is φ = 4026520.

The previous prime is 4026511. The next prime is 4026523. The reversal of 4026521 is 1256204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2560000 + 1466521 = 1600^2 + 1211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4026521 is a prime.

It is a Sophie Germain prime.

Together with 4026523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4026493 and 4026502.

It is not a weakly prime, because it can be changed into another prime (4026523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2013260 + 2013261.

It is an arithmetic number, because the mean of its divisors is an integer number (2013261).

Almost surely, 2^4026521 is an apocalyptic number.

It is an amenable number.

4026521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4026521 is an equidigital number, since it uses as much as digits as its factorization.

4026521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 4026521 is about 2006.6192962294. The cubic root of 4026521 is about 159.0901615401.

The spelling of 4026521 in words is "four million, twenty-six thousand, five hundred twenty-one".