138511777 has 2 divisors, whose sum is σ = 138511778. Its totient is φ = 138511776.

The previous prime is 138511771. The next prime is 138511781. The reversal of 138511777 is 777115831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115863696 + 22648081 = 10764^2 + 4759^2 .

It is an emirp because it is prime and its reverse (777115831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138511777 - 2¹¹ = 138509729 is a prime.

It is not a weakly prime, because it can be changed into another prime (138511771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69255888 + 69255889.

It is an arithmetic number, because the mean of its divisors is an integer number (69255889).

Almost surely, 2^138511777 is an apocalyptic number.

It is an amenable number.

138511777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138511777 is an equidigital number, since it uses as much as digits as its factorization.

138511777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41160, while the sum is 40.

The square root of 138511777 is about 11769.1026420879. The cubic root of 138511777 is about 517.4029497423.

The spelling of 138511777 in words is "one hundred thirty-eight million, five hundred eleven thousand, seven hundred seventy-seven".