138055549 has 2 divisors, whose sum is σ = 138055550. Its totient is φ = 138055548.

The previous prime is 138055523. The next prime is 138055553. The reversal of 138055549 is 945550831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 8892324 = 11365^2 + 2982^2 .

It is an emirp because it is prime and its reverse (945550831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138055549 - 2²³ = 129666941 is a prime.

It is a Chen prime.

It is equal to p_7808458 and since 138055549 and 7808458 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138455549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69027774 + 69027775.

It is an arithmetic number, because the mean of its divisors is an integer number (69027775).

Almost surely, 2^138055549 is an apocalyptic number.

It is an amenable number.

138055549 is a deficient number, since it is larger than the sum of its proper divisors (1).

138055549 is an equidigital number, since it uses as much as digits as its factorization.

138055549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 138055549 is about 11749.7042090429. The cubic root of 138055549 is about 516.8342535553.

The spelling of 138055549 in words is "one hundred thirty-eight million, fifty-five thousand, five hundred forty-nine".