228143581 has 8 divisors (see below), whose sum is σ = 231289344. Its totient is φ = 225016800.

The previous prime is 228143569. The next prime is 228143603. The reversal of 228143581 is 185341822.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228143581 - 2⁵ = 228143549 is a prime.

It is a super-2 number, since 2×228143581² = 104098987103007122, 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 (228143081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20356 + ... + 29506.

It is an arithmetic number, because the mean of its divisors is an integer number (28911168).

Almost surely, 2^228143581 is an apocalyptic number.

It is an amenable number.

228143581 is a deficient number, since it is larger than the sum of its proper divisors (3145763).

228143581 is a wasteful number, since it uses less digits than its factorization.

228143581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491.

The product of its digits is 15360, while the sum is 34.

The square root of 228143581 is about 15104.4225642690. The cubic root of 228143581 is about 611.0396862334.

The spelling of 228143581 in words is "two hundred twenty-eight million, one hundred forty-three thousand, five hundred eighty-one".