138087563 has 4 divisors (see below), whose sum is σ = 138317928. Its totient is φ = 137857200.

The previous prime is 138087559. The next prime is 138087601. The reversal of 138087563 is 365780831.

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

It is a cyclic number.

It is not a de Polignac number, because 138087563 - 2² = 138087559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138087563.

It is not an unprimeable number, because it can be changed into a prime (138087533) 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, 114281 + ... + 115482.

It is an arithmetic number, because the mean of its divisors is an integer number (34579482).

Almost surely, 2^138087563 is an apocalyptic number.

138087563 is a deficient number, since it is larger than the sum of its proper divisors (230365).

138087563 is an equidigital number, since it uses as much as digits as its factorization.

138087563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230364.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 138087563 is about 11751.0664622408. The cubic root of 138087563 is about 516.8742004055.

The spelling of 138087563 in words is "one hundred thirty-eight million, eighty-seven thousand, five hundred sixty-three".