238216565 has 4 divisors (see below), whose sum is σ = 285859884. Its totient is φ = 190573248.

The previous prime is 238216553. The next prime is 238216607. The reversal of 238216565 is 565612832.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41964484 + 196252081 = 6478^2 + 14009^2 .

It is a cyclic number.

It is not a de Polignac number, because 238216565 - 2⁴ = 238216549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23821652 + ... + 23821661.

It is an arithmetic number, because the mean of its divisors is an integer number (71464971).

Almost surely, 2^238216565 is an apocalyptic number.

It is an amenable number.

238216565 is a deficient number, since it is larger than the sum of its proper divisors (47643319).

238216565 is an equidigital number, since it uses as much as digits as its factorization.

238216565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47643318.

The product of its digits is 86400, while the sum is 38.

The square root of 238216565 is about 15434.2659365452. The cubic root of 238216565 is about 619.9033538221.

The spelling of 238216565 in words is "two hundred thirty-eight million, two hundred sixteen thousand, five hundred sixty-five".