228202561 has 4 divisors (see below), whose sum is σ = 228667824. Its totient is φ = 227737300.

The previous prime is 228202517. The next prime is 228202567. The reversal of 228202561 is 165202822.

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 an emirpimes, since its reverse is a distinct semiprime: 165202822 = 2 ⋅82601411.

It is a cyclic number.

It is not a de Polignac number, because 228202561 - 2⁹ = 228202049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228202567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231895 + ... + 232876.

It is an arithmetic number, because the mean of its divisors is an integer number (57166956).

Almost surely, 2^228202561 is an apocalyptic number.

It is an amenable number.

228202561 is a deficient number, since it is larger than the sum of its proper divisors (465263).

228202561 is an equidigital number, since it uses as much as digits as its factorization.

228202561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465262.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 228202561 is about 15106.3748464018. The cubic root of 228202561 is about 611.0923373100.

The spelling of 228202561 in words is "two hundred twenty-eight million, two hundred two thousand, five hundred sixty-one".