56562721 has 4 divisors (see below), whose sum is σ = 56612932. Its totient is φ = 56512512.

The previous prime is 56562719. The next prime is 56562743. The reversal of 56562721 is 12726565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12726565 = 5 ⋅2545313.

It can be written as a sum of positive squares in 2 ways, for example, as 45373696 + 11189025 = 6736^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 56562721 - 2¹ = 56562719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56562421) 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, 23376 + ... + 25681.

It is an arithmetic number, because the mean of its divisors is an integer number (14153233).

Almost surely, 2^56562721 is an apocalyptic number.

It is an amenable number.

56562721 is a deficient number, since it is larger than the sum of its proper divisors (50211).

56562721 is a wasteful number, since it uses less digits than its factorization.

56562721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50210.

The product of its digits is 25200, while the sum is 34.

The square root of 56562721 is about 7520.8191708085. The cubic root of 56562721 is about 383.8634519746.

The spelling of 56562721 in words is "fifty-six million, five hundred sixty-two thousand, seven hundred twenty-one".