138555211 has 2 divisors, whose sum is σ = 138555212. Its totient is φ = 138555210.

The previous prime is 138555173. The next prime is 138555227. The reversal of 138555211 is 112555831.

It is a strong prime.

It is an emirp because it is prime and its reverse (112555831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138555211 - 2²⁷ = 4337483 is a prime.

It is not a weakly prime, because it can be changed into another prime (138555251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69277605 + 69277606.

It is an arithmetic number, because the mean of its divisors is an integer number (69277606).

Almost surely, 2^138555211 is an apocalyptic number.

138555211 is a deficient number, since it is larger than the sum of its proper divisors (1).

138555211 is an equidigital number, since it uses as much as digits as its factorization.

138555211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6000, while the sum is 31.

The square root of 138555211 is about 11770.9477528362. The cubic root of 138555211 is about 517.4570258448.

The spelling of 138555211 in words is "one hundred thirty-eight million, five hundred fifty-five thousand, two hundred eleven".