54555221 has 4 divisors (see below), whose sum is σ = 62348832. Its totient is φ = 46761612.

The previous prime is 54555209. The next prime is 54555223. The reversal of 54555221 is 12255545.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54555221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54555223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3896795 + ... + 3896808.

It is an arithmetic number, because the mean of its divisors is an integer number (15587208).

Almost surely, 2^54555221 is an apocalyptic number.

It is an amenable number.

54555221 is a deficient number, since it is larger than the sum of its proper divisors (7793611).

54555221 is an equidigital number, since it uses as much as digits as its factorization.

54555221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7793610.

The product of its digits is 10000, while the sum is 29.

The square root of 54555221 is about 7386.1506212641. The cubic root of 54555221 is about 379.2673348183.

The spelling of 54555221 in words is "fifty-four million, five hundred fifty-five thousand, two hundred twenty-one".