138530561 has 8 divisors (see below), whose sum is σ = 149607360. Its totient is φ = 127513872.

The previous prime is 138530551. The next prime is 138530617. The reversal of 138530561 is 165035831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138530561 - 2¹⁰ = 138529537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138530531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10175 + ... + 19508.

It is an arithmetic number, because the mean of its divisors is an integer number (18700920).

Almost surely, 2^138530561 is an apocalyptic number.

It is an amenable number.

138530561 is a deficient number, since it is larger than the sum of its proper divisors (11076799).

138530561 is a wasteful number, since it uses less digits than its factorization.

138530561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30055.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 138530561 is about 11769.9006367938. The cubic root of 138530561 is about 517.4263375435.

The spelling of 138530561 in words is "one hundred thirty-eight million, five hundred thirty thousand, five hundred sixty-one".