55545109 has 2 divisors, whose sum is σ = 55545110. Its totient is φ = 55545108.

The previous prime is 55545107. The next prime is 55545157. The reversal of 55545109 is 90154555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51122500 + 4422609 = 7150^2 + 2103^2 .

It is a cyclic number.

It is not a de Polignac number, because 55545109 - 2¹ = 55545107 is a prime.

Together with 55545107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55545107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27772554 + 27772555.

It is an arithmetic number, because the mean of its divisors is an integer number (27772555).

Almost surely, 2^55545109 is an apocalyptic number.

It is an amenable number.

55545109 is a deficient number, since it is larger than the sum of its proper divisors (1).

55545109 is an equidigital number, since it uses as much as digits as its factorization.

55545109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 55545109 is about 7452.8591158025. The cubic root of 55545109 is about 381.5474960433.

The spelling of 55545109 in words is "fifty-five million, five hundred forty-five thousand, one hundred nine".