228661 has 4 divisors (see below), whose sum is σ = 229824. Its totient is φ = 227500.

The previous prime is 228647. The next prime is 228677. The reversal of 228661 is 166822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 228661 - 2¹³ = 220469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228601) 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, 205 + ... + 706.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2²²⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

228661 is a deficient number, since it is larger than the sum of its proper divisors (1163).

228661 is an equidigital number, since it uses as much as digits as its factorization.

228661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its digits is 1152, while the sum is 25.

The square root of 228661 is about 478.1851106005. The cubic root of 228661 is about 61.1501273958.

The spelling of 228661 in words is "two hundred twenty-eight thousand, six hundred sixty-one".