138525505 has 4 divisors (see below), whose sum is σ = 166230612. Its totient is φ = 110820400.

The previous prime is 138525487. The next prime is 138525529. The reversal of 138525505 is 505525831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505525831 = 277 ⋅1825003.

It can be written as a sum of positive squares in 2 ways, for example, as 93528241 + 44997264 = 9671^2 + 6708^2 .

It is not a de Polignac number, because 138525505 - 2¹⁵ = 138492737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 13852546 + ... + 13852555.

It is an arithmetic number, because the mean of its divisors is an integer number (41557653).

Almost surely, 2^138525505 is an apocalyptic number.

It is an amenable number.

138525505 is a deficient number, since it is larger than the sum of its proper divisors (27705107).

138525505 is an equidigital number, since it uses as much as digits as its factorization.

138525505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27705106.

The product of its (nonzero) digits is 30000, while the sum is 34.

The square root of 138525505 is about 11769.6858496733. The cubic root of 138525505 is about 517.4200425682.

The spelling of 138525505 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, five hundred five".