138000931 has 2 divisors, whose sum is σ = 138000932. Its totient is φ = 138000930.

The previous prime is 138000901. The next prime is 138000953. The reversal of 138000931 is 139000831.

It is a strong prime.

It is an emirp because it is prime and its reverse (139000831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138000931 - 2⁹ = 138000419 is a prime.

It is a super-2 number, since 2×138000931² = 38088513913733522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138000896 and 138000905.

It is not a weakly prime, because it can be changed into another prime (138000901) 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, 69000465 + 69000466.

It is an arithmetic number, because the mean of its divisors is an integer number (69000466).

Almost surely, 2^138000931 is an apocalyptic number.

138000931 is a deficient number, since it is larger than the sum of its proper divisors (1).

138000931 is an equidigital number, since it uses as much as digits as its factorization.

138000931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 138000931 is about 11747.3797503954. The cubic root of 138000931 is about 516.7660873307.

The spelling of 138000931 in words is "one hundred thirty-eight million, nine hundred thirty-one", and thus it is an aban number.