138568187 has 2 divisors, whose sum is σ = 138568188. Its totient is φ = 138568186.

The previous prime is 138568181. The next prime is 138568189. The reversal of 138568187 is 781865831.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (781865831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138568187 - 2¹² = 138564091 is a prime.

It is a super-2 number, since 2×138568187² = 38402284896933938, which contains 22 as substring.

Together with 138568189, 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 (138568181) 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, 69284093 + 69284094.

It is an arithmetic number, because the mean of its divisors is an integer number (69284094).

Almost surely, 2^138568187 is an apocalyptic number.

138568187 is a deficient number, since it is larger than the sum of its proper divisors (1).

138568187 is an equidigital number, since it uses as much as digits as its factorization.

138568187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 47.

The square root of 138568187 is about 11771.4989274943. The cubic root of 138568187 is about 517.4731790031.

The spelling of 138568187 in words is "one hundred thirty-eight million, five hundred sixty-eight thousand, one hundred eighty-seven".