55780243 has 2 divisors, whose sum is σ = 55780244. Its totient is φ = 55780242.

The previous prime is 55780223. The next prime is 55780261. The reversal of 55780243 is 34208755.

It is a happy number.

55780243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55780243 - 2¹⁷ = 55649171 is a prime.

It is a super-2 number, since 2×55780243² = 6222871018278098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55780199 and 55780208.

It is not a weakly prime, because it can be changed into another prime (55780223) 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, 27890121 + 27890122.

It is an arithmetic number, because the mean of its divisors is an integer number (27890122).

Almost surely, 2^55780243 is an apocalyptic number.

55780243 is a deficient number, since it is larger than the sum of its proper divisors (1).

55780243 is an equidigital number, since it uses as much as digits as its factorization.

55780243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 55780243 is about 7468.6172080245. The cubic root of 55780243 is about 382.0851280908.

Adding to 55780243 its reverse (34208755), we get a palindrome (89988998).

The spelling of 55780243 in words is "fifty-five million, seven hundred eighty thousand, two hundred forty-three".