56448209 has 2 divisors, whose sum is σ = 56448210. Its totient is φ = 56448208.

The previous prime is 56448173. The next prime is 56448229. The reversal of 56448209 is 90284465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43824400 + 12623809 = 6620^2 + 3553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56448209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (56448229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28224104 + 28224105.

It is an arithmetic number, because the mean of its divisors is an integer number (28224105).

Almost surely, 2^56448209 is an apocalyptic number.

It is an amenable number.

56448209 is a deficient number, since it is larger than the sum of its proper divisors (1).

56448209 is an equidigital number, since it uses as much as digits as its factorization.

56448209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 56448209 is about 7513.2023132616. The cubic root of 56448209 is about 383.6042313662.

The spelling of 56448209 in words is "fifty-six million, four hundred forty-eight thousand, two hundred nine".