228662561 has 4 divisors (see below), whose sum is σ = 229384212. Its totient is φ = 227940912.

The previous prime is 228662557. The next prime is 228662569. The reversal of 228662561 is 165266822.

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 10923025 + 217739536 = 3305^2 + 14756^2 .

It is a cyclic number.

It is not a de Polignac number, because 228662561 - 2² = 228662557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228662569) 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, 360350 + ... + 360983.

It is an arithmetic number, because the mean of its divisors is an integer number (57346053).

Almost surely, 2^228662561 is an apocalyptic number.

It is an amenable number.

228662561 is a deficient number, since it is larger than the sum of its proper divisors (721651).

228662561 is an equidigital number, since it uses as much as digits as its factorization.

228662561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721650.

The product of its digits is 69120, while the sum is 38.

The square root of 228662561 is about 15121.5925417927. The cubic root of 228662561 is about 611.5026654668.

The spelling of 228662561 in words is "two hundred twenty-eight million, six hundred sixty-two thousand, five hundred sixty-one".