138195019 has 2 divisors, whose sum is σ = 138195020. Its totient is φ = 138195018.

The previous prime is 138195007. The next prime is 138195047. The reversal of 138195019 is 910591831.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (910591831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138195019 - 2⁷ = 138194891 is a prime.

It is a super-2 number, since 2×138195019² = 38195726552820722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138195119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69097509 + 69097510.

It is an arithmetic number, because the mean of its divisors is an integer number (69097510).

Almost surely, 2^138195019 is an apocalyptic number.

138195019 is a deficient number, since it is larger than the sum of its proper divisors (1).

138195019 is an equidigital number, since it uses as much as digits as its factorization.

138195019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 37.

The square root of 138195019 is about 11755.6377538609. The cubic root of 138195019 is about 517.0082381427.

The spelling of 138195019 in words is "one hundred thirty-eight million, one hundred ninety-five thousand, nineteen".