4521509 has 2 divisors, whose sum is σ = 4521510. Its totient is φ = 4521508.

The previous prime is 4521427. The next prime is 4521523. The reversal of 4521509 is 9051254.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2630884 + 1890625 = 1622^2 + 1375^2 .

It is a cyclic number.

It is not a de Polignac number, because 4521509 - 2¹⁶ = 4455973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4521599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2260754 + 2260755.

It is an arithmetic number, because the mean of its divisors is an integer number (2260755).

Almost surely, 2^4521509 is an apocalyptic number.

It is an amenable number.

4521509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4521509 is an equidigital number, since it uses as much as digits as its factorization.

4521509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 4521509 is about 2126.3840198798. The cubic root of 4521509 is about 165.3589857692.

The spelling of 4521509 in words is "four million, five hundred twenty-one thousand, five hundred nine".