56537809 has 2 divisors, whose sum is σ = 56537810. Its totient is φ = 56537808.

The previous prime is 56537777. The next prime is 56537821. The reversal of 56537809 is 90873565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39727809 + 16810000 = 6303^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 56537809 - 2⁵ = 56537777 is a prime.

It is not a weakly prime, because it can be changed into another prime (56537839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28268904 + 28268905.

It is an arithmetic number, because the mean of its divisors is an integer number (28268905).

Almost surely, 2^56537809 is an apocalyptic number.

It is an amenable number.

56537809 is a deficient number, since it is larger than the sum of its proper divisors (1).

56537809 is an equidigital number, since it uses as much as digits as its factorization.

56537809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 56537809 is about 7519.1627858426. The cubic root of 56537809 is about 383.8070885229.

The spelling of 56537809 in words is "fifty-six million, five hundred thirty-seven thousand, eight hundred nine".