138805061 has 2 divisors, whose sum is σ = 138805062. Its totient is φ = 138805060.

The previous prime is 138805057. The next prime is 138805091. The reversal of 138805061 is 160508831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76300225 + 62504836 = 8735^2 + 7906^2 .

It is a cyclic number.

It is not a de Polignac number, because 138805061 - 2² = 138805057 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138805091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69402530 + 69402531.

It is an arithmetic number, because the mean of its divisors is an integer number (69402531).

Almost surely, 2^138805061 is an apocalyptic number.

It is an amenable number.

138805061 is a deficient number, since it is larger than the sum of its proper divisors (1).

138805061 is an equidigital number, since it uses as much as digits as its factorization.

138805061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 138805061 is about 11781.5559668492. Note that the first 3 decimals coincide. The cubic root of 138805061 is about 517.7678742606.

The spelling of 138805061 in words is "one hundred thirty-eight million, eight hundred five thousand, sixty-one".