138550019 has 2 divisors, whose sum is σ = 138550020. Its totient is φ = 138550018.

The previous prime is 138550007. The next prime is 138550103. The reversal of 138550019 is 910055831.

It is a weak prime.

It is an emirp because it is prime and its reverse (910055831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138550019 - 2¹² = 138545923 is a prime.

It is a super-2 number, since 2×138550019² = 38392215529800722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138550319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69275009 + 69275010.

It is an arithmetic number, because the mean of its divisors is an integer number (69275010).

Almost surely, 2^138550019 is an apocalyptic number.

138550019 is a deficient number, since it is larger than the sum of its proper divisors (1).

138550019 is an equidigital number, since it uses as much as digits as its factorization.

138550019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 138550019 is about 11770.7272077812. The cubic root of 138550019 is about 517.4505623072.

The spelling of 138550019 in words is "one hundred thirty-eight million, five hundred fifty thousand, nineteen".