138523149 has 8 divisors (see below), whose sum is σ = 205219520. Its totient is φ = 92348748.

The previous prime is 138523139. The next prime is 138523183. The reversal of 138523149 is 941325831.

138523149 is a `hidden beast` number, since 1 + 385 + 231 + 49 = 666.

It is not a de Polignac number, because 138523149 - 2⁵ = 138523117 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 (138523109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565217 + ... + 2565270.

It is an arithmetic number, because the mean of its divisors is an integer number (25652440).

Almost surely, 2^138523149 is an apocalyptic number.

It is an amenable number.

138523149 is a deficient number, since it is larger than the sum of its proper divisors (66696371).

138523149 is an equidigital number, since it uses as much as digits as its factorization.

138523149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5130496 (or 5130490 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 138523149 is about 11769.5857616146. The cubic root of 138523149 is about 517.4171091769.

It can be divided in two parts, 1385231 and 49, that added together give a triangular number (1385280 = T₁₆₆₄).

The spelling of 138523149 in words is "one hundred thirty-eight million, five hundred twenty-three thousand, one hundred forty-nine".