55548781 has 2 divisors, whose sum is σ = 55548782. Its totient is φ = 55548780.

The previous prime is 55548739. The next prime is 55548793. The reversal of 55548781 is 18784555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34928100 + 20620681 = 5910^2 + 4541^2 .

It is a cyclic number.

It is not a de Polignac number, because 55548781 - 2²³ = 47160173 is a prime.

It is a super-2 number, since 2×55548781² = 6171334141171922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55548881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27774390 + 27774391.

It is an arithmetic number, because the mean of its divisors is an integer number (27774391).

Almost surely, 2^55548781 is an apocalyptic number.

It is an amenable number.

55548781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55548781 is an equidigital number, since it uses as much as digits as its factorization.

55548781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 224000, while the sum is 43.

The square root of 55548781 is about 7453.1054601421. The cubic root of 55548781 is about 381.5559036935. Note that the first 3 decimals are identical.

The spelling of 55548781 in words is "fifty-five million, five hundred forty-eight thousand, seven hundred eighty-one".