55285381 has 2 divisors, whose sum is σ = 55285382. Its totient is φ = 55285380.

The previous prime is 55285367. The next prime is 55285457. The reversal of 55285381 is 18358255.

55285381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55264356 + 21025 = 7434^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 55285381 - 2⁹ = 55284869 is a prime.

It is a super-2 number, since 2×55285381² = 6112946704630322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55285381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55285361) 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, 27642690 + 27642691.

It is an arithmetic number, because the mean of its divisors is an integer number (27642691).

Almost surely, 2^55285381 is an apocalyptic number.

It is an amenable number.

55285381 is a deficient number, since it is larger than the sum of its proper divisors (1).

55285381 is an equidigital number, since it uses as much as digits as its factorization.

55285381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48000, while the sum is 37.

The square root of 55285381 is about 7435.4139763701. The cubic root of 55285381 is about 380.9518634519.

The spelling of 55285381 in words is "fifty-five million, two hundred eighty-five thousand, three hundred eighty-one".