138207271 has 2 divisors, whose sum is σ = 138207272. Its totient is φ = 138207270.

The previous prime is 138207241. The next prime is 138207287. The reversal of 138207271 is 172702831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138207271 - 2¹³ = 138199079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138207241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69103635 + 69103636.

It is an arithmetic number, because the mean of its divisors is an integer number (69103636).

Almost surely, 2^138207271 is an apocalyptic number.

138207271 is a deficient number, since it is larger than the sum of its proper divisors (1).

138207271 is an equidigital number, since it uses as much as digits as its factorization.

138207271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 138207271 is about 11756.1588539795. The cubic root of 138207271 is about 517.0235165461.

The spelling of 138207271 in words is "one hundred thirty-eight million, two hundred seven thousand, two hundred seventy-one".