56726209 has 2 divisors, whose sum is σ = 56726210. Its totient is φ = 56726208.

The previous prime is 56726203. The next prime is 56726221. The reversal of 56726209 is 90262765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55577025 + 1149184 = 7455^2 + 1072^2 .

It is a cyclic number.

It is not a de Polignac number, because 56726209 - 2⁵ = 56726177 is a prime.

It is not a weakly prime, because it can be changed into another prime (56726203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28363104 + 28363105.

It is an arithmetic number, because the mean of its divisors is an integer number (28363105).

Almost surely, 2^56726209 is an apocalyptic number.

It is an amenable number.

56726209 is a deficient number, since it is larger than the sum of its proper divisors (1).

56726209 is an equidigital number, since it uses as much as digits as its factorization.

56726209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 56726209 is about 7531.6803569987. The cubic root of 56726209 is about 384.2329338513.

It can be divided in two parts, 5672 and 6209, that added together give a square (11881 = 109²).

The spelling of 56726209 in words is "fifty-six million, seven hundred twenty-six thousand, two hundred nine".