228143609 has 4 divisors (see below), whose sum is σ = 236010660. Its totient is φ = 220276560.

The previous prime is 228143603. The next prime is 228143611. The reversal of 228143609 is 906341822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906341822 = 2 ⋅453170911.

It can be written as a sum of positive squares in 2 ways, for example, as 44622400 + 183521209 = 6680^2 + 13547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228143609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228143603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3933482 + ... + 3933539.

It is an arithmetic number, because the mean of its divisors is an integer number (59002665).

Almost surely, 2^228143609 is an apocalyptic number.

228143609 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

228143609 is a deficient number, since it is larger than the sum of its proper divisors (7867051).

228143609 is an equidigital number, since it uses as much as digits as its factorization.

228143609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7867050.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 228143609 is about 15104.4234911499. The cubic root of 228143609 is about 611.0397112309.

The spelling of 228143609 in words is "two hundred twenty-eight million, one hundred forty-three thousand, six hundred nine".