55620281 has 2 divisors, whose sum is σ = 55620282. Its totient is φ = 55620280.

The previous prime is 55620269. The next prime is 55620307. The reversal of 55620281 is 18202655.

55620281 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., 55279225 + 341056 = 7435^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 55620281 - 2¹⁴ = 55603897 is a prime.

It is a super-2 number, since 2×55620281² = 6187231317037922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55620181) 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, 27810140 + 27810141.

It is an arithmetic number, because the mean of its divisors is an integer number (27810141).

Almost surely, 2^55620281 is an apocalyptic number.

It is an amenable number.

55620281 is a deficient number, since it is larger than the sum of its proper divisors (1).

55620281 is an equidigital number, since it uses as much as digits as its factorization.

55620281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 55620281 is about 7457.9005758994. The cubic root of 55620281 is about 381.7195409501.

The spelling of 55620281 in words is "fifty-five million, six hundred twenty thousand, two hundred eighty-one".