138994061 has 2 divisors, whose sum is σ = 138994062. Its totient is φ = 138994060.

The previous prime is 138994043. The next prime is 138994109. The reversal of 138994061 is 160499831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101404900 + 37589161 = 10070^2 + 6131^2 .

It is a cyclic number.

It is not a de Polignac number, because 138994061 - 2⁶ = 138993997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138994021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69497030 + 69497031.

It is an arithmetic number, because the mean of its divisors is an integer number (69497031).

Almost surely, 2^138994061 is an apocalyptic number.

It is an amenable number.

138994061 is a deficient number, since it is larger than the sum of its proper divisors (1).

138994061 is an equidigital number, since it uses as much as digits as its factorization.

138994061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 138994061 is about 11789.5742501585. The cubic root of 138994061 is about 518.0027690256.

The spelling of 138994061 in words is "one hundred thirty-eight million, nine hundred ninety-four thousand, sixty-one".