228220561 has 2 divisors, whose sum is σ = 228220562. Its totient is φ = 228220560.

The previous prime is 228220511. The next prime is 228220583. The reversal of 228220561 is 165022822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228161025 + 59536 = 15105^2 + 244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228220561 is a prime.

It is not a weakly prime, because it can be changed into another prime (228220511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114110280 + 114110281.

It is an arithmetic number, because the mean of its divisors is an integer number (114110281).

Almost surely, 2^228220561 is an apocalyptic number.

It is an amenable number.

228220561 is a deficient number, since it is larger than the sum of its proper divisors (1).

228220561 is an equidigital number, since it uses as much as digits as its factorization.

228220561 is an odious number, because the sum of its binary digits is odd.

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

The square root of 228220561 is about 15106.9706096226. The cubic root of 228220561 is about 611.1084039905.

The spelling of 228220561 in words is "two hundred twenty-eight million, two hundred twenty thousand, five hundred sixty-one".