228280909 has 2 divisors, whose sum is σ = 228280910. Its totient is φ = 228280908.

The previous prime is 228280891. The next prime is 228281041. The reversal of 228280909 is 909082822.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213802884 + 14478025 = 14622^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 228280909 - 2⁷ = 228280781 is a prime.

It is a super-2 number, since 2×228280909² = 104224346827732562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228280309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114140454 + 114140455.

It is an arithmetic number, because the mean of its divisors is an integer number (114140455).

Almost surely, 2^228280909 is an apocalyptic number.

It is an amenable number.

228280909 is a deficient number, since it is larger than the sum of its proper divisors (1).

228280909 is an equidigital number, since it uses as much as digits as its factorization.

228280909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 228280909 is about 15108.9678337072. The cubic root of 228280909 is about 611.1622640512.

The spelling of 228280909 in words is "two hundred twenty-eight million, two hundred eighty thousand, nine hundred nine".