55947509 has 2 divisors, whose sum is σ = 55947510. Its totient is φ = 55947508.

The previous prime is 55947499. The next prime is 55947539. The reversal of 55947509 is 90574955.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44182609 + 11764900 = 6647^2 + 3430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55947509 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55947509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55947539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27973754 + 27973755.

It is an arithmetic number, because the mean of its divisors is an integer number (27973755).

Almost surely, 2^55947509 is an apocalyptic number.

It is an amenable number.

55947509 is a deficient number, since it is larger than the sum of its proper divisors (1).

55947509 is an equidigital number, since it uses as much as digits as its factorization.

55947509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 283500, while the sum is 44.

The square root of 55947509 is about 7479.8067488405. The cubic root of 55947509 is about 382.4666614827.

The spelling of 55947509 in words is "fifty-five million, nine hundred forty-seven thousand, five hundred nine".