55578109 has 2 divisors, whose sum is σ = 55578110. Its totient is φ = 55578108.

The previous prime is 55578053. The next prime is 55578139. The reversal of 55578109 is 90187555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 27594009 = 5290^2 + 5253^2 .

It is a cyclic number.

It is not a de Polignac number, because 55578109 - 2¹¹ = 55576061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55578139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27789054 + 27789055.

It is an arithmetic number, because the mean of its divisors is an integer number (27789055).

Almost surely, 2^55578109 is an apocalyptic number.

It is an amenable number.

55578109 is a deficient number, since it is larger than the sum of its proper divisors (1).

55578109 is an equidigital number, since it uses as much as digits as its factorization.

55578109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 55578109 is about 7455.0727025295. The cubic root of 55578109 is about 381.6230416970.

The spelling of 55578109 in words is "fifty-five million, five hundred seventy-eight thousand, one hundred nine".