138991059 has 20 divisors (see below), whose sum is σ = 208074504. Its totient is φ = 92461824.

The previous prime is 138991057. The next prime is 138991063. The reversal of 138991059 is 950199831.

It is not a de Polignac number, because 138991059 - 2¹ = 138991057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138991057) 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 in 19 ways as a sum of consecutive naturals, for example, 42739 + ... + 45875.

Almost surely, 2^138991059 is an apocalyptic number.

138991059 is a deficient number, since it is larger than the sum of its proper divisors (69083445).

138991059 is an equidigital number, since it uses as much as digits as its factorization.

138991059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696 (or 3687 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 138991059 is about 11789.4469335928. The cubic root of 138991059 is about 517.9990397164. Note that the first 3 decimals are identical.

The spelling of 138991059 in words is "one hundred thirty-eight million, nine hundred ninety-one thousand, fifty-nine".