55646909 has 2 divisors, whose sum is σ = 55646910. Its totient is φ = 55646908.

The previous prime is 55646897. The next prime is 55646939. The reversal of 55646909 is 90964655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49042009 + 6604900 = 7003^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 55646909 - 2⁸ = 55646653 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55646909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55646939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27823454 + 27823455.

It is an arithmetic number, because the mean of its divisors is an integer number (27823455).

Almost surely, 2^55646909 is an apocalyptic number.

It is an amenable number.

55646909 is a deficient number, since it is larger than the sum of its proper divisors (1).

55646909 is an equidigital number, since it uses as much as digits as its factorization.

55646909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 55646909 is about 7459.6855831865. The cubic root of 55646909 is about 381.7804468291.

The spelling of 55646909 in words is "fifty-five million, six hundred forty-six thousand, nine hundred nine".