138511275 has 48 divisors (see below), whose sum is σ = 263268864. Its totient is φ = 62945280.

The previous prime is 138511271. The next prime is 138511283. The reversal of 138511275 is 572115831.

It is not a de Polignac number, because 138511275 - 2² = 138511271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138511271) 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 47 ways as a sum of consecutive naturals, for example, 100642 + ... + 102008.

It is an arithmetic number, because the mean of its divisors is an integer number (5484768).

Almost surely, 2^138511275 is an apocalyptic number.

138511275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138511275 is a deficient number, since it is larger than the sum of its proper divisors (124757589).

138511275 is a wasteful number, since it uses less digits than its factorization.

138511275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580 (or 1575 counting only the distinct ones).

The product of its digits is 8400, while the sum is 33.

The square root of 138511275 is about 11769.0813150390. The cubic root of 138511275 is about 517.4023246773.

The spelling of 138511275 in words is "one hundred thirty-eight million, five hundred eleven thousand, two hundred seventy-five".