228521871 has 16 divisors (see below), whose sum is σ = 358466400. Its totient is φ = 143385984.

The previous prime is 228521869. The next prime is 228521899. The reversal of 228521871 is 178125822.

It is not a de Polignac number, because 228521871 - 2¹ = 228521869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228521971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248476 + ... + 249393.

It is an arithmetic number, because the mean of its divisors is an integer number (22404150).

Almost surely, 2^228521871 is an apocalyptic number.

228521871 is a deficient number, since it is larger than the sum of its proper divisors (129944529).

228521871 is a wasteful number, since it uses less digits than its factorization.

228521871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497895 (or 497889 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 228521871 is about 15116.9398689020. The cubic root of 228521871 is about 611.3772259543.

The spelling of 228521871 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, eight hundred seventy-one".