138355211 has 2 divisors, whose sum is σ = 138355212. Its totient is φ = 138355210.

The previous prime is 138355171. The next prime is 138355229. The reversal of 138355211 is 112553831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138355211 - 2¹⁰ = 138354187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138355111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69177605 + 69177606.

It is an arithmetic number, because the mean of its divisors is an integer number (69177606).

Almost surely, 2^138355211 is an apocalyptic number.

138355211 is a deficient number, since it is larger than the sum of its proper divisors (1).

138355211 is an equidigital number, since it uses as much as digits as its factorization.

138355211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 29.

The square root of 138355211 is about 11762.4491922388. The cubic root of 138355211 is about 517.2079284155.

The spelling of 138355211 in words is "one hundred thirty-eight million, three hundred fifty-five thousand, two hundred eleven".