228508081 has 4 divisors (see below), whose sum is σ = 236387700. Its totient is φ = 220628464.

The previous prime is 228508061. The next prime is 228508153. The reversal of 228508081 is 180805822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180805822 = 2 ⋅90402911.

It can be written as a sum of positive squares in 2 ways, for example, as 73256481 + 155251600 = 8559^2 + 12460^2 .

It is a cyclic number.

It is not a de Polignac number, because 228508081 - 2²¹ = 226410929 is a prime.

It is a super-2 number, since 2×228508081² = 104431886164605122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228508051) 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, 3939766 + ... + 3939823.

It is an arithmetic number, because the mean of its divisors is an integer number (59096925).

Almost surely, 2^228508081 is an apocalyptic number.

It is an amenable number.

228508081 is a deficient number, since it is larger than the sum of its proper divisors (7879619).

228508081 is an equidigital number, since it uses as much as digits as its factorization.

228508081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7879618.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 228508081 is about 15116.4837511903. The cubic root of 228508081 is about 611.3649279899.

The spelling of 228508081 in words is "two hundred twenty-eight million, five hundred eight thousand, eighty-one".