138601777 has 2 divisors, whose sum is σ = 138601778. Its totient is φ = 138601776.

The previous prime is 138601717. The next prime is 138601781. The reversal of 138601777 is 777106831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138509361 + 92416 = 11769^2 + 304^2 .

It is a cyclic number.

It is not a de Polignac number, because 138601777 - 2⁷ = 138601649 is a prime.

It is a Chen prime.

It is equal to p_7837528 and since 138601777 and 7837528 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138601717) 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, 69300888 + 69300889.

It is an arithmetic number, because the mean of its divisors is an integer number (69300889).

Almost surely, 2^138601777 is an apocalyptic number.

It is an amenable number.

138601777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138601777 is an equidigital number, since it uses as much as digits as its factorization.

138601777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 138601777 is about 11772.9255922222. The cubic root of 138601777 is about 517.5149887916.

The spelling of 138601777 in words is "one hundred thirty-eight million, six hundred one thousand, seven hundred seventy-seven".