138149271 has 24 divisors (see below), whose sum is σ = 217329840. Its totient is φ = 84053376.

The previous prime is 138149227. The next prime is 138149273. The reversal of 138149271 is 172941831.

It is a happy number.

138149271 is a `hidden beast` number, since 1 + 381 + 4 + 9 + 271 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-138149271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138149273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3780 + ... + 17046.

It is an arithmetic number, because the mean of its divisors is an integer number (9055410).

Almost surely, 2^138149271 is an apocalyptic number.

138149271 is a deficient number, since it is larger than the sum of its proper divisors (79180569).

138149271 is a wasteful number, since it uses less digits than its factorization.

138149271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13375 (or 13372 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 138149271 is about 11753.6918030039. The cubic root of 138149271 is about 516.9511818091.

The spelling of 138149271 in words is "one hundred thirty-eight million, one hundred forty-nine thousand, two hundred seventy-one".