138880549 has 2 divisors, whose sum is σ = 138880550. Its totient is φ = 138880548.

The previous prime is 138880541. The next prime is 138880561. The reversal of 138880549 is 945088831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138815524 + 65025 = 11782^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 138880549 - 2³ = 138880541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138880499 and 138880508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138880541) 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, 69440274 + 69440275.

It is an arithmetic number, because the mean of its divisors is an integer number (69440275).

Almost surely, 2^138880549 is an apocalyptic number.

It is an amenable number.

138880549 is a deficient number, since it is larger than the sum of its proper divisors (1).

138880549 is an equidigital number, since it uses as much as digits as its factorization.

138880549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 138880549 is about 11784.7591829447. The cubic root of 138880549 is about 517.8617185286.

The spelling of 138880549 in words is "one hundred thirty-eight million, eight hundred eighty thousand, five hundred forty-nine".