56127721 has 4 divisors (see below), whose sum is σ = 60445252. Its totient is φ = 51810192.

The previous prime is 56127719. The next prime is 56127733. The reversal of 56127721 is 12772165.

56127721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 22429696 + 33698025 = 4736^2 + 5805^2 .

It is a cyclic number.

It is not a de Polignac number, because 56127721 - 2¹ = 56127719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56127781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2158746 + ... + 2158771.

It is an arithmetic number, because the mean of its divisors is an integer number (15111313).

Almost surely, 2^56127721 is an apocalyptic number.

It is an amenable number.

56127721 is a deficient number, since it is larger than the sum of its proper divisors (4317531).

56127721 is a wasteful number, since it uses less digits than its factorization.

56127721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4317530.

The product of its digits is 5880, while the sum is 31.

The square root of 56127721 is about 7491.8436315769. The cubic root of 56127721 is about 382.8768746195.

Adding to 56127721 its reverse (12772165), we get a palindrome (68899886).

It can be divided in two parts, 561 and 27721, that added together give a palindrome (28282).

The spelling of 56127721 in words is "fifty-six million, one hundred twenty-seven thousand, seven hundred twenty-one".