228169409 has 4 divisors (see below), whose sum is σ = 245720916. Its totient is φ = 210617904.

The previous prime is 228169397. The next prime is 228169421. The reversal of 228169409 is 904961822.

228169409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (228169397) and next prime (228169421).

It can be written as a sum of positive squares in 2 ways, for example, as 28569025 + 199600384 = 5345^2 + 14128^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228169409 is a prime.

It is a super-2 number, since 2×228169409² = 104122558406818562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228169429) 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, 8775734 + ... + 8775759.

It is an arithmetic number, because the mean of its divisors is an integer number (61430229).

Almost surely, 2^228169409 is an apocalyptic number.

It is an amenable number.

228169409 is a deficient number, since it is larger than the sum of its proper divisors (17551507).

228169409 is a wasteful number, since it uses less digits than its factorization.

228169409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17551506.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 228169409 is about 15105.2775214493. The cubic root of 228169409 is about 611.0627438439.

The spelling of 228169409 in words is "two hundred twenty-eight million, one hundred sixty-nine thousand, four hundred nine".