55720291 has 4 divisors (see below), whose sum is σ = 60785784. Its totient is φ = 50654800.

The previous prime is 55720289. The next prime is 55720297. The reversal of 55720291 is 19202755.

55720291 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 is a cyclic number.

It is not a de Polignac number, because 55720291 - 2¹ = 55720289 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55720297) 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, 2532730 + ... + 2532751.

It is an arithmetic number, because the mean of its divisors is an integer number (15196446).

Almost surely, 2^55720291 is an apocalyptic number.

55720291 is a deficient number, since it is larger than the sum of its proper divisors (5065493).

55720291 is a wasteful number, since it uses less digits than its factorization.

55720291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5065492.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 55720291 is about 7464.6025346297. The cubic root of 55720291 is about 381.9481920365.

The spelling of 55720291 in words is "fifty-five million, seven hundred twenty thousand, two hundred ninety-one".