138526555 has 4 divisors (see below), whose sum is σ = 166231872. Its totient is φ = 110821240.

The previous prime is 138526517. The next prime is 138526561. The reversal of 138526555 is 555625831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138526555 - 2¹⁷ = 138395483 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13852651 + ... + 13852660.

It is an arithmetic number, because the mean of its divisors is an integer number (41557968).

Almost surely, 2^138526555 is an apocalyptic number.

138526555 is a deficient number, since it is larger than the sum of its proper divisors (27705317).

138526555 is an equidigital number, since it uses as much as digits as its factorization.

138526555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27705316.

The product of its digits is 180000, while the sum is 40.

The square root of 138526555 is about 11769.7304557071. The cubic root of 138526555 is about 517.4213498838.

The spelling of 138526555 in words is "one hundred thirty-eight million, five hundred twenty-six thousand, five hundred fifty-five".