228025409 has 2 divisors, whose sum is σ = 228025410. Its totient is φ = 228025408.

The previous prime is 228025397. The next prime is 228025411. The reversal of 228025409 is 904520822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120384784 + 107640625 = 10972^2 + 10375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228025409 is a prime.

Together with 228025411, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_12539831 and since 228025409 and 12539831 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (228025439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114012704 + 114012705.

It is an arithmetic number, because the mean of its divisors is an integer number (114012705).

Almost surely, 2^228025409 is an apocalyptic number.

It is an amenable number.

228025409 is a deficient number, since it is larger than the sum of its proper divisors (1).

228025409 is an equidigital number, since it uses as much as digits as its factorization.

228025409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 228025409 is about 15100.5102231680. The cubic root of 228025409 is about 610.9341675182.

The spelling of 228025409 in words is "two hundred twenty-eight million, twenty-five thousand, four hundred nine".