55284781 has 2 divisors, whose sum is σ = 55284782. Its totient is φ = 55284780.

The previous prime is 55284767. The next prime is 55284809. The reversal of 55284781 is 18748255.

55284781 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., 50836900 + 4447881 = 7130^2 + 2109^2 .

It is a cyclic number.

It is not a de Polignac number, because 55284781 - 2²³ = 46896173 is a prime.

It is a super-2 number, since 2×55284781² = 6112814020435922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55281781) 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, 27642390 + 27642391.

It is an arithmetic number, because the mean of its divisors is an integer number (27642391).

Almost surely, 2^55284781 is an apocalyptic number.

It is an amenable number.

55284781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55284781 is an equidigital number, since it uses as much as digits as its factorization.

55284781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 89600, while the sum is 40.

The square root of 55284781 is about 7435.3736288098. The cubic root of 55284781 is about 380.9504853182.

It can be divided in two parts, 55284 and 781, that added together give a palindrome (56065).

The spelling of 55284781 in words is "fifty-five million, two hundred eighty-four thousand, seven hundred eighty-one".