55646309 has 2 divisors, whose sum is σ = 55646310. Its totient is φ = 55646308.

The previous prime is 55646251. The next prime is 55646341. The reversal of 55646309 is 90364655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 1329409 = 7370^2 + 1153^2 .

It is a cyclic number.

It is not a de Polignac number, because 55646309 - 2⁸ = 55646053 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55646359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27823154 + 27823155.

It is an arithmetic number, because the mean of its divisors is an integer number (27823155).

Almost surely, 2^55646309 is an apocalyptic number.

It is an amenable number.

55646309 is a deficient number, since it is larger than the sum of its proper divisors (1).

55646309 is an equidigital number, since it uses as much as digits as its factorization.

55646309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 55646309 is about 7459.6453669059. The cubic root of 55646309 is about 381.7790746709.

It can be divided in two parts, 55646 and 309, that added together give a palindrome (55955).

The spelling of 55646309 in words is "fifty-five million, six hundred forty-six thousand, three hundred nine".