138721163 has 12 divisors (see below), whose sum is σ = 162513360. Its totient is φ = 115993920.

The previous prime is 138721159. The next prime is 138721169. The reversal of 138721163 is 361127831.

It is not a de Polignac number, because 138721163 - 2² = 138721159 is a prime.

It is a super-2 number, since 2×138721163² = 38487122128145138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138721169) 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 11 ways as a sum of consecutive naturals, for example, 5873 + ... + 17661.

It is an arithmetic number, because the mean of its divisors is an integer number (13542780).

Almost surely, 2^138721163 is an apocalyptic number.

138721163 is a deficient number, since it is larger than the sum of its proper divisors (23792197).

138721163 is an equidigital number, since it uses as much as digits as its factorization.

138721163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11878 (or 11837 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 138721163 is about 11777.9948633033. The cubic root of 138721163 is about 517.6635350196.

Adding to 138721163 its reverse (361127831), we get a palindrome (499848994).

The spelling of 138721163 in words is "one hundred thirty-eight million, seven hundred twenty-one thousand, one hundred sixty-three".