138581077 has 2 divisors, whose sum is σ = 138581078. Its totient is φ = 138581076.

The previous prime is 138581071. The next prime is 138581123. The reversal of 138581077 is 770185831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129254161 + 9326916 = 11369^2 + 3054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138581077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138581071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69290538 + 69290539.

It is an arithmetic number, because the mean of its divisors is an integer number (69290539).

Almost surely, 2^138581077 is an apocalyptic number.

It is an amenable number.

138581077 is a deficient number, since it is larger than the sum of its proper divisors (1).

138581077 is an equidigital number, since it uses as much as digits as its factorization.

138581077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 40.

The square root of 138581077 is about 11772.0464236258. The cubic root of 138581077 is about 517.4892241060.

The spelling of 138581077 in words is "one hundred thirty-eight million, five hundred eighty-one thousand, seventy-seven".