138991063 has 2 divisors, whose sum is σ = 138991064. Its totient is φ = 138991062.

The previous prime is 138991057. The next prime is 138991067. The reversal of 138991063 is 360199831.

138991063 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138991063 - 2¹⁷ = 138859991 is a prime.

It is equal to p_7858354 and since 138991063 and 7858354 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 (138991067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69495531 + 69495532.

It is an arithmetic number, because the mean of its divisors is an integer number (69495532).

Almost surely, 2^138991063 is an apocalyptic number.

138991063 is a deficient number, since it is larger than the sum of its proper divisors (1).

138991063 is an equidigital number, since it uses as much as digits as its factorization.

138991063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 138991063 is about 11789.4471032360. The cubic root of 138991063 is about 517.9990446855. Note that the first 3 decimals are identical.

The spelling of 138991063 in words is "one hundred thirty-eight million, nine hundred ninety-one thousand, sixty-three".