55186009 has 2 divisors, whose sum is σ = 55186010. Its totient is φ = 55186008.

The previous prime is 55185997. The next prime is 55186031. The reversal of 55186009 is 90068155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48441600 + 6744409 = 6960^2 + 2597^2 .

It is a cyclic number.

It is not a de Polignac number, because 55186009 - 2⁷ = 55185881 is a prime.

It is not a weakly prime, because it can be changed into another prime (55186609) 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, 27593004 + 27593005.

It is an arithmetic number, because the mean of its divisors is an integer number (27593005).

Almost surely, 2^55186009 is an apocalyptic number.

It is an amenable number.

55186009 is a deficient number, since it is larger than the sum of its proper divisors (1).

55186009 is an equidigital number, since it uses as much as digits as its factorization.

55186009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 55186009 is about 7428.7286260840. The cubic root of 55186009 is about 380.7234808802.

The spelling of 55186009 in words is "fifty-five million, one hundred eighty-six thousand, nine".