4487521 has 2 divisors, whose sum is σ = 4487522. Its totient is φ = 4487520.

The previous prime is 4487519. The next prime is 4487537. The reversal of 4487521 is 1257844.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4145296 + 342225 = 2036^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 4487521 - 2¹ = 4487519 is a prime.

Together with 4487519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4487321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2243760 + 2243761.

It is an arithmetic number, because the mean of its divisors is an integer number (2243761).

Almost surely, 2^4487521 is an apocalyptic number.

It is an amenable number.

4487521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4487521 is an equidigital number, since it uses as much as digits as its factorization.

4487521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 31.

The square root of 4487521 is about 2118.3769730622. The cubic root of 4487521 is about 164.9436109730.

The spelling of 4487521 in words is "four million, four hundred eighty-seven thousand, five hundred twenty-one".