228216571 has 4 divisors (see below), whose sum is σ = 248963544. Its totient is φ = 207469600.

The previous prime is 228216553. The next prime is 228216601. The reversal of 228216571 is 175612822.

It is a happy number.

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 228216571 - 2⁹ = 228216059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228216371) 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, 10373470 + ... + 10373491.

It is an arithmetic number, because the mean of its divisors is an integer number (62240886).

Almost surely, 2^228216571 is an apocalyptic number.

228216571 is a deficient number, since it is larger than the sum of its proper divisors (20746973).

228216571 is a wasteful number, since it uses less digits than its factorization.

228216571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20746972.

The product of its digits is 13440, while the sum is 34.

The square root of 228216571 is about 15106.8385508021. The cubic root of 228216571 is about 611.1048426158.

It can be divided in two parts, 22821 and 6571, that added together give a palindrome (29392).

The spelling of 228216571 in words is "two hundred twenty-eight million, two hundred sixteen thousand, five hundred seventy-one".