228318581 has 4 divisors (see below), whose sum is σ = 228534432. Its totient is φ = 228102732.

The previous prime is 228318577. The next prime is 228318589. The reversal of 228318581 is 185813822.

It is a happy number.

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 228318581 - 2² = 228318577 is a prime.

It is a super-2 number, since 2×228318581² = 104258748859707122, 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 (228318589) 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, 106331 + ... + 108456.

It is an arithmetic number, because the mean of its divisors is an integer number (57133608).

Almost surely, 2^228318581 is an apocalyptic number.

It is an amenable number.

228318581 is a deficient number, since it is larger than the sum of its proper divisors (215851).

228318581 is a wasteful number, since it uses less digits than its factorization.

228318581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215850.

The product of its digits is 30720, while the sum is 38.

The square root of 228318581 is about 15110.2144591002. The cubic root of 228318581 is about 611.1958811687.

The spelling of 228318581 in words is "two hundred twenty-eight million, three hundred eighteen thousand, five hundred eighty-one".