56308509 has 6 divisors (see below), whose sum is σ = 81334526. Its totient is φ = 37539000.

The previous prime is 56308489. The next prime is 56308523. The reversal of 56308509 is 90580365.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 18301284 = 6165^2 + 4278^2 .

It is not a de Polignac number, because 56308509 - 2²⁰ = 55259933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56308529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3128242 + ... + 3128259.

Almost surely, 2^56308509 is an apocalyptic number.

It is an amenable number.

56308509 is a deficient number, since it is larger than the sum of its proper divisors (25026017).

56308509 is a wasteful number, since it uses less digits than its factorization.

56308509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6256507 (or 6256504 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 56308509 is about 7503.8995862152. The cubic root of 56308509 is about 383.2875175657.

The spelling of 56308509 in words is "fifty-six million, three hundred eight thousand, five hundred nine".