138521436967 has 2 divisors, whose sum is σ = 138521436968. Its totient is φ = 138521436966.

The previous prime is 138521436943. The next prime is 138521436973. The reversal of 138521436967 is 769634125831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138521436967 - 2⁷ = 138521436839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138521436467) 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, 69260718483 + 69260718484.

It is an arithmetic number, because the mean of its divisors is an integer number (69260718484).

Almost surely, 2^138521436967 is an apocalyptic number.

138521436967 is a deficient number, since it is larger than the sum of its proper divisors (1).

138521436967 is an equidigital number, since it uses as much as digits as its factorization.

138521436967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 55.

The spelling of 138521436967 in words is "one hundred thirty-eight billion, five hundred twenty-one million, four hundred thirty-six thousand, nine hundred sixty-seven".