138555227 has 2 divisors, whose sum is σ = 138555228. Its totient is φ = 138555226.

The previous prime is 138555211. The next prime is 138555233. The reversal of 138555227 is 722555831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138555227 - 2⁴ = 138555211 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138555247) 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, 69277613 + 69277614.

It is an arithmetic number, because the mean of its divisors is an integer number (69277614).

Almost surely, 2^138555227 is an apocalyptic number.

138555227 is a deficient number, since it is larger than the sum of its proper divisors (1).

138555227 is an equidigital number, since it uses as much as digits as its factorization.

138555227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84000, while the sum is 38.

The square root of 138555227 is about 11770.9484324756. The cubic root of 138555227 is about 517.4570457630.

The spelling of 138555227 in words is "one hundred thirty-eight million, five hundred fifty-five thousand, two hundred twenty-seven".