138275279 has 2 divisors, whose sum is σ = 138275280. Its totient is φ = 138275278.

The previous prime is 138275273. The next prime is 138275281. The reversal of 138275279 is 972572831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138275279 - 2²⁴ = 121498063 is a prime.

It is a Sophie Germain prime.

Together with 138275281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138275273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69137639 + 69137640.

It is an arithmetic number, because the mean of its divisors is an integer number (69137640).

Almost surely, 2^138275279 is an apocalyptic number.

138275279 is a deficient number, since it is larger than the sum of its proper divisors (1).

138275279 is an equidigital number, since it uses as much as digits as its factorization.

138275279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 138275279 is about 11759.0509395954. The cubic root of 138275279 is about 517.1083069946.

It can be divided in two parts, 1382752 and 79, that added together give a palindrome (1382831).

The spelling of 138275279 in words is "one hundred thirty-eight million, two hundred seventy-five thousand, two hundred seventy-nine".