55043993 has 2 divisors, whose sum is σ = 55043994. Its totient is φ = 55043992.

The previous prime is 55043953. The next prime is 55044029. The reversal of 55043993 is 39934055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38291344 + 16752649 = 6188^2 + 4093^2 .

It is a cyclic number.

It is not a de Polignac number, because 55043993 - 2¹⁸ = 54781849 is a prime.

It is not a weakly prime, because it can be changed into another prime (55043953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27521996 + 27521997.

It is an arithmetic number, because the mean of its divisors is an integer number (27521997).

Almost surely, 2^55043993 is an apocalyptic number.

It is an amenable number.

55043993 is a deficient number, since it is larger than the sum of its proper divisors (1).

55043993 is an equidigital number, since it uses as much as digits as its factorization.

55043993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 38.

The square root of 55043993 is about 7419.1639016806. The cubic root of 55043993 is about 380.3966149854.

The spelling of 55043993 in words is "fifty-five million, forty-three thousand, nine hundred ninety-three".