228551789 has 4 divisors (see below), whose sum is σ = 230814780. Its totient is φ = 226288800.

The previous prime is 228551783. The next prime is 228551801. The reversal of 228551789 is 987155822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987155822 = 2 ⋅493577911.

It can be written as a sum of positive squares in 2 ways, for example, as 118091689 + 110460100 = 10867^2 + 10510^2 .

It is a cyclic number.

It is not a de Polignac number, because 228551789 - 2²⁴ = 211774573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228551783) 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, 1131344 + ... + 1131545.

It is an arithmetic number, because the mean of its divisors is an integer number (57703695).

Almost surely, 2^228551789 is an apocalyptic number.

It is an amenable number.

228551789 is a deficient number, since it is larger than the sum of its proper divisors (2262991).

228551789 is a wasteful number, since it uses less digits than its factorization.

228551789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262990.

The product of its digits is 403200, while the sum is 47.

The square root of 228551789 is about 15117.9293886431. The cubic root of 228551789 is about 611.4039052179.

The spelling of 228551789 in words is "two hundred twenty-eight million, five hundred fifty-one thousand, seven hundred eighty-nine".