228547309 has 4 divisors (see below), whose sum is σ = 228594240. Its totient is φ = 228500380.

The previous prime is 228547301. The next prime is 228547313. The reversal of 228547309 is 903745822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228547309 - 2³ = 228547301 is a prime.

It is a super-2 number, since 2×228547309² = 104467744902282962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228547301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15187 + ... + 26224.

It is an arithmetic number, because the mean of its divisors is an integer number (57148560).

Almost surely, 2^228547309 is an apocalyptic number.

It is an amenable number.

228547309 is a deficient number, since it is larger than the sum of its proper divisors (46931).

228547309 is an equidigital number, since it uses as much as digits as its factorization.

228547309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46930.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 228547309 is about 15117.7812194779. The cubic root of 228547309 is about 611.3999103430.

It can be divided in two parts, 2285 and 47309, that added together give a palindrome (49594).

The spelling of 228547309 in words is "two hundred twenty-eight million, five hundred forty-seven thousand, three hundred nine".