4001509 has 2 divisors, whose sum is σ = 4001510. Its totient is φ = 4001508.

The previous prime is 4001483. The next prime is 4001521. The reversal of 4001509 is 9051004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3045025 + 956484 = 1745^2 + 978^2 .

It is a cyclic number.

It is not a de Polignac number, because 4001509 - 2¹¹ = 3999461 is a prime.

4001509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4001549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000754 + 2000755.

It is an arithmetic number, because the mean of its divisors is an integer number (2000755).

Almost surely, 2^4001509 is an apocalyptic number.

It is an amenable number.

4001509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001509 is an equidigital number, since it uses as much as digits as its factorization.

4001509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 4001509 is about 2000.3772144273. The cubic root of 4001509 is about 158.7600642554.

The spelling of 4001509 in words is "four million, one thousand, five hundred nine".