54136521 has 6 divisors (see below), whose sum is σ = 78197210. Its totient is φ = 36091008.

The previous prime is 54136507. The next prime is 54136541. The reversal of 54136521 is 12563145.

54136521 is a `hidden beast` number, since 5 + 4 + 1 + 3 + 652 + 1 = 666.

54136521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50765625 + 3370896 = 7125^2 + 1836^2 .

It is not a de Polignac number, because 54136521 - 2⁷ = 54136393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (54136541) 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 5 ways as a sum of consecutive naturals, for example, 3007576 + ... + 3007593.

Almost surely, 2^54136521 is an apocalyptic number.

It is an amenable number.

54136521 is a deficient number, since it is larger than the sum of its proper divisors (24060689).

54136521 is a wasteful number, since it uses less digits than its factorization.

54136521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6015175 (or 6015172 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 54136521 is about 7357.7524421524. The cubic root of 54136521 is about 378.2945759534.

Adding to 54136521 its reverse (12563145), we get a palindrome (66699666).

The spelling of 54136521 in words is "fifty-four million, one hundred thirty-six thousand, five hundred twenty-one".