138557077 has 2 divisors, whose sum is σ = 138557078. Its totient is φ = 138557076.

The previous prime is 138557071. The next prime is 138557087. The reversal of 138557077 is 770755831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127441521 + 11115556 = 11289^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 138557077 - 2¹⁹ = 138032789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138557071) 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, 69278538 + 69278539.

It is an arithmetic number, because the mean of its divisors is an integer number (69278539).

Almost surely, 2^138557077 is an apocalyptic number.

It is an amenable number.

138557077 is a deficient number, since it is larger than the sum of its proper divisors (1).

138557077 is an equidigital number, since it uses as much as digits as its factorization.

138557077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 205800, while the sum is 43.

The square root of 138557077 is about 11771.0270155157. The cubic root of 138557077 is about 517.4593487948.

The spelling of 138557077 in words is "one hundred thirty-eight million, five hundred fifty-seven thousand, seventy-seven".