54997221 has 4 divisors (see below), whose sum is σ = 73329632. Its totient is φ = 36664812.

The previous prime is 54997181. The next prime is 54997231. The reversal of 54997221 is 12279945.

54997221 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.

It is not a de Polignac number, because 54997221 - 2¹³ = 54989029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 54997221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54997231) 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, 9166201 + ... + 9166206.

It is an arithmetic number, because the mean of its divisors is an integer number (18332408).

Almost surely, 2^54997221 is an apocalyptic number.

It is an amenable number.

54997221 is a deficient number, since it is larger than the sum of its proper divisors (18332411).

54997221 is a wasteful number, since it uses less digits than its factorization.

54997221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18332410.

The product of its digits is 45360, while the sum is 39.

The square root of 54997221 is about 7416.0111245871. The cubic root of 54997221 is about 380.2888408744.

It can be divided in two parts, 5499 and 7221, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 54997221 in words is "fifty-four million, nine hundred ninety-seven thousand, two hundred twenty-one".