4056509 has 2 divisors, whose sum is σ = 4056510. Its totient is φ = 4056508.

The previous prime is 4056473. The next prime is 4056517. The reversal of 4056509 is 9056504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3062500 + 994009 = 1750^2 + 997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4056509 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 (4056529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2028254 + 2028255.

It is an arithmetic number, because the mean of its divisors is an integer number (2028255).

Almost surely, 2^4056509 is an apocalyptic number.

It is an amenable number.

4056509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4056509 is an equidigital number, since it uses as much as digits as its factorization.

4056509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 4056509 is about 2014.0777045586. The cubic root of 4056509 is about 159.4841328149.

The spelling of 4056509 in words is "four million, fifty-six thousand, five hundred nine".