2228123209 has 9 divisors (see below), whose sum is σ = 2413366119. Its totient is φ = 2056162680.

The previous prime is 2228123159. The next prime is 2228123231. The reversal of 2228123209 is 9023218222.

The square root of 2228123209 is 47203.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 329604025 + 1898519184 = 18155^2 + 43572^2 .

It is not a de Polignac number, because 2228123209 - 2¹³ = 2228115017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2228123269) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 611824 + ... + 615454.

It is an arithmetic number, because the mean of its divisors is an integer number (268151791).

Almost surely, 2^2228123209 is an apocalyptic number.

2228123209 is the 47203-rd square number.

2228123209 is the 23602-nd centered octagonal number.

It is an amenable number.

2228123209 is a deficient number, since it is larger than the sum of its proper divisors (185242910).

2228123209 is an frugal number, since it uses more digits than its factorization.

2228123209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7288 (or 3644 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The cubic root of 2228123209 is about 1306.1099385887.

The spelling of 2228123209 in words is "two billion, two hundred twenty-eight million, one hundred twenty-three thousand, two hundred nine".