54490021 has 4 divisors (see below), whose sum is σ = 54528012. Its totient is φ = 54452032.

The previous prime is 54489991. The next prime is 54490031. The reversal of 54490021 is 12009445.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52272900 + 2217121 = 7230^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 54490021 - 2⁷ = 54489893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54490031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16756 + ... + 19741.

It is an arithmetic number, because the mean of its divisors is an integer number (13632003).

Almost surely, 2^54490021 is an apocalyptic number.

It is an amenable number.

54490021 is a deficient number, since it is larger than the sum of its proper divisors (37991).

54490021 is a wasteful number, since it uses less digits than its factorization.

54490021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37990.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 54490021 is about 7381.7356360141. The cubic root of 54490021 is about 379.1161846785.

Adding to 54490021 its reverse (12009445), we get a palindrome (66499466).

The spelling of 54490021 in words is "fifty-four million, four hundred ninety thousand, twenty-one".