55452781 has 2 divisors, whose sum is σ = 55452782. Its totient is φ = 55452780.

The previous prime is 55452767. The next prime is 55452797. The reversal of 55452781 is 18725455.

55452781 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., 53890281 + 1562500 = 7341^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 55452781 - 2⁷ = 55452653 is a prime.

It is a super-2 number, since 2×55452781² = 6150021841267922, 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 55452781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55452581) 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, 27726390 + 27726391.

It is an arithmetic number, because the mean of its divisors is an integer number (27726391).

Almost surely, 2^55452781 is an apocalyptic number.

It is an amenable number.

55452781 is a deficient number, since it is larger than the sum of its proper divisors (1).

55452781 is an equidigital number, since it uses as much as digits as its factorization.

55452781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56000, while the sum is 37.

The square root of 55452781 is about 7446.6624067430. The cubic root of 55452781 is about 381.3359739461.

It can be divided in two parts, 554 and 52781, that added together give a palindrome (53335).

The spelling of 55452781 in words is "fifty-five million, four hundred fifty-two thousand, seven hundred eighty-one".