138255619 has 2 divisors, whose sum is σ = 138255620. Its totient is φ = 138255618.

The previous prime is 138255617. The next prime is 138255671. The reversal of 138255619 is 916552831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138255619 - 2¹ = 138255617 is a prime.

It is a super-2 number, since 2×138255619² = 38229232370146322, which contains 22 as substring.

Together with 138255617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138255617) 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, 69127809 + 69127810.

It is an arithmetic number, because the mean of its divisors is an integer number (69127810).

Almost surely, 2^138255619 is an apocalyptic number.

138255619 is a deficient number, since it is larger than the sum of its proper divisors (1).

138255619 is an equidigital number, since it uses as much as digits as its factorization.

138255619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 40.

The square root of 138255619 is about 11758.2149580623. The cubic root of 138255619 is about 517.0837983207.

The spelling of 138255619 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, six hundred nineteen".