138515149 has 4 divisors (see below), whose sum is σ = 145805440. Its totient is φ = 131224860.

The previous prime is 138515141. The next prime is 138515159. The reversal of 138515149 is 941515831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138515149 - 2³ = 138515141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138515141) 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 in 3 ways as a sum of consecutive naturals, for example, 3645117 + ... + 3645154.

It is an arithmetic number, because the mean of its divisors is an integer number (36451360).

Almost surely, 2^138515149 is an apocalyptic number.

138515149 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138515149 is a deficient number, since it is larger than the sum of its proper divisors (7290291).

138515149 is an equidigital number, since it uses as much as digits as its factorization.

138515149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290290.

The product of its digits is 21600, while the sum is 37.

The square root of 138515149 is about 11769.2458976776. The cubic root of 138515149 is about 517.4071483470.

The spelling of 138515149 in words is "one hundred thirty-eight million, five hundred fifteen thousand, one hundred forty-nine".