138525555 has 32 divisors (see below), whose sum is σ = 253974528. Its totient is φ = 63158400.

The previous prime is 138525553. The next prime is 138525559. The reversal of 138525555 is 555525831.

It is a happy number.

138525555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138525555 - 2¹ = 138525553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138525553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43725 + ... + 46785.

It is an arithmetic number, because the mean of its divisors is an integer number (7936704).

Almost surely, 2^138525555 is an apocalyptic number.

138525555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138525555 is a deficient number, since it is larger than the sum of its proper divisors (115448973).

138525555 is a wasteful number, since it uses less digits than its factorization.

138525555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3507.

The product of its digits is 150000, while the sum is 39.

The square root of 138525555 is about 11769.6879737740. The cubic root of 138525555 is about 517.4201048215.

The spelling of 138525555 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, five hundred fifty-five".