55443209 has 2 divisors, whose sum is σ = 55443210. Its totient is φ = 55443208.

The previous prime is 55443169. The next prime is 55443217. The reversal of 55443209 is 90234455.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 7182400 = 6947^2 + 2680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55443209 is a prime.

It is not a weakly prime, because it can be changed into another prime (55443259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27721604 + 27721605.

It is an arithmetic number, because the mean of its divisors is an integer number (27721605).

Almost surely, 2^55443209 is an apocalyptic number.

It is an amenable number.

55443209 is a deficient number, since it is larger than the sum of its proper divisors (1).

55443209 is an equidigital number, since it uses as much as digits as its factorization.

55443209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 55443209 is about 7446.0196749673. The cubic root of 55443209 is about 381.3140312054.

The spelling of 55443209 in words is "fifty-five million, four hundred forty-three thousand, two hundred nine".