56409565 has 4 divisors (see below), whose sum is σ = 67691484. Its totient is φ = 45127648.

The previous prime is 56409559. The next prime is 56409581. The reversal of 56409565 is 56590465.

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 14341369 + 42068196 = 3787^2 + 6486^2 .

It is a cyclic number.

It is not a de Polignac number, because 56409565 - 2³ = 56409557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5640952 + ... + 5640961.

It is an arithmetic number, because the mean of its divisors is an integer number (16922871).

Almost surely, 2^56409565 is an apocalyptic number.

It is an amenable number.

56409565 is a deficient number, since it is larger than the sum of its proper divisors (11281919).

56409565 is a wasteful number, since it uses less digits than its factorization.

56409565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11281918.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 56409565 is about 7510.6301333510. The cubic root of 56409565 is about 383.5166739026.

The spelling of 56409565 in words is "fifty-six million, four hundred nine thousand, five hundred sixty-five".