55253921 has 2 divisors, whose sum is σ = 55253922. Its totient is φ = 55253920.

The previous prime is 55253911. The next prime is 55253923. The reversal of 55253921 is 12935255.

55253921 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., 34093921 + 21160000 = 5839^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 55253921 - 2¹⁸ = 54991777 is a prime.

Together with 55253923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55253923) 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, 27626960 + 27626961.

It is an arithmetic number, because the mean of its divisors is an integer number (27626961).

Almost surely, 2^55253921 is an apocalyptic number.

It is an amenable number.

55253921 is a deficient number, since it is larger than the sum of its proper divisors (1).

55253921 is an equidigital number, since it uses as much as digits as its factorization.

55253921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 32.

The square root of 55253921 is about 7433.2981239824. The cubic root of 55253921 is about 380.8795898573.

The spelling of 55253921 in words is "fifty-five million, two hundred fifty-three thousand, nine hundred twenty-one".