228940081 has 4 divisors (see below), whose sum is σ = 229022964. Its totient is φ = 228857200.

The previous prime is 228940027. The next prime is 228940087. The reversal of 228940081 is 180049822.

228940081 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 can be written as a sum of positive squares in 2 ways, for example, as 51624225 + 177315856 = 7185^2 + 13316^2 .

It is a cyclic number.

It is not a de Polignac number, because 228940081 - 2¹¹ = 228938033 is a prime.

It is a super-2 number, since 2×228940081² = 104827121376573122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228940087) 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, 37150 + ... + 42871.

It is an arithmetic number, because the mean of its divisors is an integer number (57255741).

Almost surely, 2^228940081 is an apocalyptic number.

It is an amenable number.

228940081 is a deficient number, since it is larger than the sum of its proper divisors (82883).

228940081 is an equidigital number, since it uses as much as digits as its factorization.

228940081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82882.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 228940081 is about 15130.7660414138. The cubic root of 228940081 is about 611.7499521389.

The spelling of 228940081 in words is "two hundred twenty-eight million, nine hundred forty thousand, eighty-one".