138755563 has 4 divisors (see below), whose sum is σ = 138782160. Its totient is φ = 138728968.

The previous prime is 138755557. The next prime is 138755569. The reversal of 138755563 is 365557831.

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

It is an interprime number because it is at equal distance from previous prime (138755557) and next prime (138755569).

It is a cyclic number.

It is not a de Polignac number, because 138755563 - 2⁹ = 138755051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138755569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2608 + ... + 16861.

It is an arithmetic number, because the mean of its divisors is an integer number (34695540).

Almost surely, 2^138755563 is an apocalyptic number.

138755563 is a deficient number, since it is larger than the sum of its proper divisors (26597).

138755563 is an equidigital number, since it uses as much as digits as its factorization.

138755563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26596.

The product of its digits is 378000, while the sum is 43.

The square root of 138755563 is about 11779.4551232220. The cubic root of 138755563 is about 517.7063214588.

The spelling of 138755563 in words is "one hundred thirty-eight million, seven hundred fifty-five thousand, five hundred sixty-three".