228502561 has 4 divisors (see below), whose sum is σ = 261145792. Its totient is φ = 195859332.

The previous prime is 228502541. The next prime is 228502567. The reversal of 228502561 is 165205822.

228502561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 165205822 = 2 ⋅82602911.

It is a cyclic number.

It is not a de Polignac number, because 228502561 - 2⁵ = 228502529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228502567) 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, 16321605 + ... + 16321618.

It is an arithmetic number, because the mean of its divisors is an integer number (65286448).

Almost surely, 2^228502561 is an apocalyptic number.

It is an amenable number.

228502561 is a deficient number, since it is larger than the sum of its proper divisors (32643231).

228502561 is an equidigital number, since it uses as much as digits as its factorization.

228502561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32643230.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 228502561 is about 15116.3011679445. The cubic root of 228502561 is about 611.3600050982.

The spelling of 228502561 in words is "two hundred twenty-eight million, five hundred two thousand, five hundred sixty-one".