56045509 has 4 divisors (see below), whose sum is σ = 60356716. Its totient is φ = 51734304.

The previous prime is 56045471. The next prime is 56045513. The reversal of 56045509 is 90554065.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30492484 + 25553025 = 5522^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 56045509 - 2²³ = 47656901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56045569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155584 + ... + 2155609.

It is an arithmetic number, because the mean of its divisors is an integer number (15089179).

Almost surely, 2^56045509 is an apocalyptic number.

It is an amenable number.

56045509 is a deficient number, since it is larger than the sum of its proper divisors (4311207).

56045509 is a wasteful number, since it uses less digits than its factorization.

56045509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4311206.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 56045509 is about 7486.3548539994. The cubic root of 56045509 is about 382.6898460945.

The spelling of 56045509 in words is "fifty-six million, forty-five thousand, five hundred nine".