228238861 has 2 divisors, whose sum is σ = 228238862. Its totient is φ = 228238860.

The previous prime is 228238799. The next prime is 228238897. The reversal of 228238861 is 168832822.

228238861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136749636 + 91489225 = 11694^2 + 9565^2 .

It is a cyclic number.

It is not a de Polignac number, because 228238861 - 2¹⁹ = 227714573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228238561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114119430 + 114119431.

It is an arithmetic number, because the mean of its divisors is an integer number (114119431).

Almost surely, 2^228238861 is an apocalyptic number.

It is an amenable number.

228238861 is a deficient number, since it is larger than the sum of its proper divisors (1).

228238861 is an equidigital number, since it uses as much as digits as its factorization.

228238861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 40.

The square root of 228238861 is about 15107.5762781460. The cubic root of 228238861 is about 611.1247375829.

It can be divided in two parts, 22823 and 8861, that added together give a square (31684 = 178²).

The spelling of 228238861 in words is "two hundred twenty-eight million, two hundred thirty-eight thousand, eight hundred sixty-one".