54155921 has 2 divisors, whose sum is σ = 54155922. Its totient is φ = 54155920.

The previous prime is 54155879. The next prime is 54155939. The reversal of 54155921 is 12955145.

54155921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35760400 + 18395521 = 5980^2 + 4289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54155921 is a prime.

It is not a weakly prime, because it can be changed into another prime (54155021) 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 as a sum of consecutive naturals, namely, 27077960 + 27077961.

It is an arithmetic number, because the mean of its divisors is an integer number (27077961).

Almost surely, 2^54155921 is an apocalyptic number.

It is an amenable number.

54155921 is a deficient number, since it is larger than the sum of its proper divisors (1).

54155921 is an equidigital number, since it uses as much as digits as its factorization.

54155921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 32.

The square root of 54155921 is about 7359.0706614355. The cubic root of 54155921 is about 378.3397582578.

The spelling of 54155921 in words is "fifty-four million, one hundred fifty-five thousand, nine hundred twenty-one".