55306409 has 2 divisors, whose sum is σ = 55306410. Its totient is φ = 55306408.

The previous prime is 55306403. The next prime is 55306411. The reversal of 55306409 is 90460355.

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., 33028009 + 22278400 = 5747^2 + 4720^2 .

It is a cyclic number.

It is not a de Polignac number, because 55306409 - 2²⁴ = 38529193 is a prime.

Together with 55306411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55306403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27653204 + 27653205.

It is an arithmetic number, because the mean of its divisors is an integer number (27653205).

Almost surely, 2^55306409 is an apocalyptic number.

It is an amenable number.

55306409 is a deficient number, since it is larger than the sum of its proper divisors (1).

55306409 is an equidigital number, since it uses as much as digits as its factorization.

55306409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 55306409 is about 7436.8278855975. The cubic root of 55306409 is about 381.0001561484. Note that the first 3 decimals are identical.

The spelling of 55306409 in words is "fifty-five million, three hundred six thousand, four hundred nine".