228238561 has 2 divisors, whose sum is σ = 228238562. Its totient is φ = 228238560.

The previous prime is 228238559. The next prime is 228238573. The reversal of 228238561 is 165832822.

228238561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188787600 + 39450961 = 13740^2 + 6281^2 .

It is a cyclic number.

It is not a de Polignac number, because 228238561 - 2¹ = 228238559 is a prime.

Together with 228238559, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 228238561.

It is not a weakly prime, because it can be changed into another prime (228238531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114119280 + 114119281.

It is an arithmetic number, because the mean of its divisors is an integer number (114119281).

Almost surely, 2^228238561 is an apocalyptic number.

It is an amenable number.

228238561 is a deficient number, since it is larger than the sum of its proper divisors (1).

228238561 is an equidigital number, since it uses as much as digits as its factorization.

228238561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 37.

The square root of 228238561 is about 15107.5663493496. The cubic root of 228238561 is about 611.1244698261.

The spelling of 228238561 in words is "two hundred twenty-eight million, two hundred thirty-eight thousand, five hundred sixty-one".