138899017 has 2 divisors, whose sum is σ = 138899018. Its totient is φ = 138899016.

The previous prime is 138898927. The next prime is 138899023. The reversal of 138899017 is 710998831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97990201 + 40908816 = 9899^2 + 6396^2 .

It is an emirp because it is prime and its reverse (710998831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138899017 - 2⁷ = 138898889 is a prime.

It is not a weakly prime, because it can be changed into another prime (138891017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69449508 + 69449509.

It is an arithmetic number, because the mean of its divisors is an integer number (69449509).

Almost surely, 2^138899017 is an apocalyptic number.

It is an amenable number.

138899017 is a deficient number, since it is larger than the sum of its proper divisors (1).

138899017 is an equidigital number, since it uses as much as digits as its factorization.

138899017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 138899017 is about 11785.5427113052. The cubic root of 138899017 is about 517.8846721781.

The spelling of 138899017 in words is "one hundred thirty-eight million, eight hundred ninety-nine thousand, seventeen".