228106261 has 4 divisors (see below), whose sum is σ = 228994092. Its totient is φ = 227218432.

The previous prime is 228106243. The next prime is 228106279. The reversal of 228106261 is 162601822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162601822 = 2 ⋅81300911.

It is an interprime number because it is at equal distance from previous prime (228106243) and next prime (228106279).

It can be written as a sum of positive squares in 2 ways, for example, as 221831236 + 6275025 = 14894^2 + 2505^2 .

It is a cyclic number.

It is not a de Polignac number, because 228106261 - 2¹¹ = 228104213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228106211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443530 + ... + 444043.

It is an arithmetic number, because the mean of its divisors is an integer number (57248523).

Almost surely, 2^228106261 is an apocalyptic number.

It is an amenable number.

228106261 is a deficient number, since it is larger than the sum of its proper divisors (887831).

228106261 is an equidigital number, since it uses as much as digits as its factorization.

228106261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887830.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 228106261 is about 15103.1871139836. The cubic root of 228106261 is about 611.0063662154.

The spelling of 228106261 in words is "two hundred twenty-eight million, one hundred six thousand, two hundred sixty-one".