55122187 has 2 divisors, whose sum is σ = 55122188. Its totient is φ = 55122186.

The previous prime is 55122181. The next prime is 55122203. The reversal of 55122187 is 78122155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55122187 - 2¹⁹ = 54597899 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55122181) 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, 27561093 + 27561094.

It is an arithmetic number, because the mean of its divisors is an integer number (27561094).

Almost surely, 2^55122187 is an apocalyptic number.

55122187 is a deficient number, since it is larger than the sum of its proper divisors (1).

55122187 is an equidigital number, since it uses as much as digits as its factorization.

55122187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 31.

The square root of 55122187 is about 7424.4317627681. The cubic root of 55122187 is about 380.5766567880.

The spelling of 55122187 in words is "fifty-five million, one hundred twenty-two thousand, one hundred eighty-seven".