55852721 has 4 divisors (see below), whose sum is σ = 57362292. Its totient is φ = 54343152.

The previous prime is 55852703. The next prime is 55852729. The reversal of 55852721 is 12725855.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12725855 = 5 ⋅2545171.

It can be written as a sum of positive squares in 2 ways, for example, as 27709696 + 28143025 = 5264^2 + 5305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55852721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55852729) 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, 754730 + ... + 754803.

It is an arithmetic number, because the mean of its divisors is an integer number (14340573).

Almost surely, 2^55852721 is an apocalyptic number.

It is an amenable number.

55852721 is a deficient number, since it is larger than the sum of its proper divisors (1509571).

55852721 is a wasteful number, since it uses less digits than its factorization.

55852721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509570.

The product of its digits is 28000, while the sum is 35.

The square root of 55852721 is about 7473.4678028342. The cubic root of 55852721 is about 382.2505437702.

The spelling of 55852721 in words is "fifty-five million, eight hundred fifty-two thousand, seven hundred twenty-one".