42504809 has 2 divisors, whose sum is σ = 42504810. Its totient is φ = 42504808.

The previous prime is 42504731. The next prime is 42504817. The reversal of 42504809 is 90840524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 6744409 = 5980^2 + 2597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42504809 is a prime.

It is not a weakly prime, because it can be changed into another prime (42504829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21252404 + 21252405.

It is an arithmetic number, because the mean of its divisors is an integer number (21252405).

Almost surely, 2^42504809 is an apocalyptic number.

It is an amenable number.

42504809 is a deficient number, since it is larger than the sum of its proper divisors (1).

42504809 is an equidigital number, since it uses as much as digits as its factorization.

42504809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 42504809 is about 6519.5712282327. The cubic root of 42504809 is about 348.9897644253.

The spelling of 42504809 in words is "forty-two million, five hundred four thousand, eight hundred nine".