55505291 has 4 divisors (see below), whose sum is σ = 57005472. Its totient is φ = 54005112.

The previous prime is 55505227. The next prime is 55505297. The reversal of 55505291 is 19250555.

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 55505291 - 2⁶ = 55505227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55505297) 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, 750035 + ... + 750108.

It is an arithmetic number, because the mean of its divisors is an integer number (14251368).

Almost surely, 2^55505291 is an apocalyptic number.

55505291 is a deficient number, since it is larger than the sum of its proper divisors (1500181).

55505291 is a wasteful number, since it uses less digits than its factorization.

55505291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500180.

The product of its (nonzero) digits is 11250, while the sum is 32.

The square root of 55505291 is about 7450.1873130815. The cubic root of 55505291 is about 381.4563023559.

The spelling of 55505291 in words is "fifty-five million, five hundred five thousand, two hundred ninety-one".