138811019 has 2 divisors, whose sum is σ = 138811020. Its totient is φ = 138811018.

The previous prime is 138810983. The next prime is 138811021. The reversal of 138811019 is 910118831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138811019 is a prime.

It is a super-2 number, since 2×138811019² = 38536997991636722, which contains 22 as substring.

Together with 138811021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138811039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69405509 + 69405510.

It is an arithmetic number, because the mean of its divisors is an integer number (69405510).

Almost surely, 2^138811019 is an apocalyptic number.

138811019 is a deficient number, since it is larger than the sum of its proper divisors (1).

138811019 is an equidigital number, since it uses as much as digits as its factorization.

138811019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 32.

The square root of 138811019 is about 11781.8088169856. The cubic root of 138811019 is about 517.7752822923.

The spelling of 138811019 in words is "one hundred thirty-eight million, eight hundred eleven thousand, nineteen".