138167819 has 2 divisors, whose sum is σ = 138167820. Its totient is φ = 138167818.

The previous prime is 138167797. The next prime is 138167933. The reversal of 138167819 is 918761831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138167819 - 2²⁰ = 137119243 is a prime.

It is a super-2 number, since 2×138167819² = 38180692414433522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138167819.

It is not a weakly prime, because it can be changed into another prime (138167119) 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, 69083909 + 69083910.

It is an arithmetic number, because the mean of its divisors is an integer number (69083910).

Almost surely, 2^138167819 is an apocalyptic number.

138167819 is a deficient number, since it is larger than the sum of its proper divisors (1).

138167819 is an equidigital number, since it uses as much as digits as its factorization.

138167819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 138167819 is about 11754.4808052079. The cubic root of 138167819 is about 516.9743161608.

The spelling of 138167819 in words is "one hundred thirty-eight million, one hundred sixty-seven thousand, eight hundred nineteen".