56543909 has 2 divisors, whose sum is σ = 56543910. Its totient is φ = 56543908.

The previous prime is 56543899. The next prime is 56543947. The reversal of 56543909 is 90934565.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46444225 + 10099684 = 6815^2 + 3178^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56543909 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 (56543009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28271954 + 28271955.

It is an arithmetic number, because the mean of its divisors is an integer number (28271955).

Almost surely, 2^56543909 is an apocalyptic number.

It is an amenable number.

56543909 is a deficient number, since it is larger than the sum of its proper divisors (1).

56543909 is an equidigital number, since it uses as much as digits as its factorization.

56543909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 56543909 is about 7519.5684051679. The cubic root of 56543909 is about 383.8208913160.

The spelling of 56543909 in words is "fifty-six million, five hundred forty-three thousand, nine hundred nine".