55186139 has 2 divisors, whose sum is σ = 55186140. Its totient is φ = 55186138.

The previous prime is 55186133. The next prime is 55186147. The reversal of 55186139 is 93168155.

55186139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55186139 is a prime.

It is not a weakly prime, because it can be changed into another prime (55186133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27593069 + 27593070.

It is an arithmetic number, because the mean of its divisors is an integer number (27593070).

Almost surely, 2^55186139 is an apocalyptic number.

55186139 is a deficient number, since it is larger than the sum of its proper divisors (1).

55186139 is an equidigital number, since it uses as much as digits as its factorization.

55186139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 55186139 is about 7428.7373758937. The cubic root of 55186139 is about 380.7237798328.

The spelling of 55186139 in words is "fifty-five million, one hundred eighty-six thousand, one hundred thirty-nine".