138130481 has 2 divisors, whose sum is σ = 138130482. Its totient is φ = 138130480.

The previous prime is 138130471. The next prime is 138130507. The reversal of 138130481 is 184031831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109411600 + 28718881 = 10460^2 + 5359^2 .

It is an emirp because it is prime and its reverse (184031831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138130481 - 2⁶ = 138130417 is a prime.

It is a super-2 number, since 2×138130481² = 38160059562582722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138130411) 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, 69065240 + 69065241.

It is an arithmetic number, because the mean of its divisors is an integer number (69065241).

Almost surely, 2^138130481 is an apocalyptic number.

It is an amenable number.

138130481 is a deficient number, since it is larger than the sum of its proper divisors (1).

138130481 is an equidigital number, since it uses as much as digits as its factorization.

138130481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 138130481 is about 11752.8924524987. The cubic root of 138130481 is about 516.9277435068.

The spelling of 138130481 in words is "one hundred thirty-eight million, one hundred thirty thousand, four hundred eighty-one".