138367961987 has 2 divisors, whose sum is σ = 138367961988. Its totient is φ = 138367961986.

The previous prime is 138367961959. The next prime is 138367962041. The reversal of 138367961987 is 789169763831.

138367961987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138367961987 - 2⁸ = 138367961731 is a prime.

It is a super-3 number, since 3×138367961987³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (138367961387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69183980993 + 69183980994.

It is an arithmetic number, because the mean of its divisors is an integer number (69183980994).

Almost surely, 2^138367961987 is an apocalyptic number.

138367961987 is a deficient number, since it is larger than the sum of its proper divisors (1).

138367961987 is an equidigital number, since it uses as much as digits as its factorization.

138367961987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82301184, while the sum is 68.

The spelling of 138367961987 in words is "one hundred thirty-eight billion, three hundred sixty-seven million, nine hundred sixty-one thousand, nine hundred eighty-seven".