54517221 has 12 divisors (see below), whose sum is σ = 85906080. Its totient is φ = 33040680.

The previous prime is 54517219. The next prime is 54517223. The reversal of 54517221 is 12271545.

It is an interprime number because it is at equal distance from previous prime (54517219) and next prime (54517223).

It is not a de Polignac number, because 54517221 - 2¹ = 54517219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54517223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275241 + ... + 275438.

It is an arithmetic number, because the mean of its divisors is an integer number (7158840).

Almost surely, 2^54517221 is an apocalyptic number.

It is an amenable number.

54517221 is a deficient number, since it is larger than the sum of its proper divisors (31388859).

54517221 is a wasteful number, since it uses less digits than its factorization.

54517221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550696 (or 550693 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 54517221 is about 7383.5777912879. The cubic root of 54517221 is about 379.1792558286.

Adding to 54517221 its reverse (12271545), we get a palindrome (66788766).

It can be divided in two parts, 545 and 17221, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 54517221 in words is "fifty-four million, five hundred seventeen thousand, two hundred twenty-one".