227821073 has 2 divisors, whose sum is σ = 227821074. Its totient is φ = 227821072.

The previous prime is 227821067. The next prime is 227821081. The reversal of 227821073 is 370128722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222099409 + 5721664 = 14903^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 227821073 - 2⁴ = 227821057 is a prime.

It is not a weakly prime, because it can be changed into another prime (227824073) 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 as a sum of consecutive naturals, namely, 113910536 + 113910537.

It is an arithmetic number, because the mean of its divisors is an integer number (113910537).

Almost surely, 2^227821073 is an apocalyptic number.

It is an amenable number.

227821073 is a deficient number, since it is larger than the sum of its proper divisors (1).

227821073 is an equidigital number, since it uses as much as digits as its factorization.

227821073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 227821073 is about 15093.7428426484. The cubic root of 227821073 is about 610.7516247743.

Adding to 227821073 its reverse (370128722), we get a palindrome (597949795).

The spelling of 227821073 in words is "two hundred twenty-seven million, eight hundred twenty-one thousand, seventy-three".