238566561 has 8 divisors (see below), whose sum is σ = 320195904. Its totient is φ = 157990800.

The previous prime is 238566551. The next prime is 238566563. The reversal of 238566561 is 165665832.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-238566561 is a prime.

It is a super-3 number, since 3×238566561³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (238566563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262866 + ... + 263771.

It is an arithmetic number, because the mean of its divisors is an integer number (40024488).

Almost surely, 2^238566561 is an apocalyptic number.

It is an amenable number.

238566561 is a deficient number, since it is larger than the sum of its proper divisors (81629343).

238566561 is a wasteful number, since it uses less digits than its factorization.

238566561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526791.

The product of its digits is 259200, while the sum is 42.

The square root of 238566561 is about 15445.6000530896. The cubic root of 238566561 is about 620.2067997279.

The spelling of 238566561 in words is "two hundred thirty-eight million, five hundred sixty-six thousand, five hundred sixty-one".