54542221 has 4 divisors (see below), whose sum is σ = 55356352. Its totient is φ = 53728092.

The previous prime is 54542209. The next prime is 54542233. The reversal of 54542221 is 12224545.

54542221 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12224545 = 5 ⋅2444909.

It is an interprime number because it is at equal distance from previous prime (54542209) and next prime (54542233).

It is a cyclic number.

It is not a de Polignac number, because 54542221 - 2⁷ = 54542093 is a prime.

It is a super-2 number, since 2×54542221² = 5949707743225682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54542251) 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, 406965 + ... + 407098.

It is an arithmetic number, because the mean of its divisors is an integer number (13839088).

Almost surely, 2^54542221 is an apocalyptic number.

It is an amenable number.

54542221 is a deficient number, since it is larger than the sum of its proper divisors (814131).

54542221 is an equidigital number, since it uses as much as digits as its factorization.

54542221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814130.

The product of its digits is 3200, while the sum is 25.

The square root of 54542221 is about 7385.2705434534. The cubic root of 54542221 is about 379.2372071364.

Adding to 54542221 its reverse (12224545), we get a palindrome (66766766).

The spelling of 54542221 in words is "fifty-four million, five hundred forty-two thousand, two hundred twenty-one".