4145509 has 2 divisors, whose sum is σ = 4145510. Its totient is φ = 4145508.

The previous prime is 4145503. The next prime is 4145527. The reversal of 4145509 is 9055414.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2512225 + 1633284 = 1585^2 + 1278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4145509 is a prime.

It is a Chen prime.

4145509 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4145503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2072754 + 2072755.

It is an arithmetic number, because the mean of its divisors is an integer number (2072755).

Almost surely, 2^4145509 is an apocalyptic number.

It is an amenable number.

4145509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4145509 is an equidigital number, since it uses as much as digits as its factorization.

4145509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 4145509 is about 2036.0523077760. The cubic root of 4145509 is about 160.6420684169.

The spelling of 4145509 in words is "four million, one hundred forty-five thousand, five hundred nine".