138281571 has 12 divisors (see below), whose sum is σ = 203015280. Its totient is φ = 90676080.

The previous prime is 138281531. The next prime is 138281573. The reversal of 138281571 is 175182831.

138281571 is a `hidden beast` number, since 1 + 3 + 8 + 2 + 81 + 571 = 666.

It is not a de Polignac number, because 138281571 - 2¹⁰ = 138280547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138281573) 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 11 ways as a sum of consecutive naturals, for example, 125391 + ... + 126488.

It is an arithmetic number, because the mean of its divisors is an integer number (16917940).

Almost surely, 2^138281571 is an apocalyptic number.

138281571 is a deficient number, since it is larger than the sum of its proper divisors (64733709).

138281571 is a wasteful number, since it uses less digits than its factorization.

138281571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251946 (or 251943 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 138281571 is about 11759.3184751498. The cubic root of 138281571 is about 517.1161502769.

The spelling of 138281571 in words is "one hundred thirty-eight million, two hundred eighty-one thousand, five hundred seventy-one".