228665851 has 2 divisors, whose sum is σ = 228665852. Its totient is φ = 228665850.

The previous prime is 228665849. The next prime is 228665867. The reversal of 228665851 is 158566822.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228665851 - 2¹ = 228665849 is a prime.

Together with 228665849, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 228665798 and 228665807.

It is not a weakly prime, because it can be changed into another prime (228668851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114332925 + 114332926.

It is an arithmetic number, because the mean of its divisors is an integer number (114332926).

Almost surely, 2^228665851 is an apocalyptic number.

228665851 is a deficient number, since it is larger than the sum of its proper divisors (1).

228665851 is an equidigital number, since it uses as much as digits as its factorization.

228665851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 43.

The square root of 228665851 is about 15121.7013262397. The cubic root of 228665851 is about 611.5055982222.

The spelling of 228665851 in words is "two hundred twenty-eight million, six hundred sixty-five thousand, eight hundred fifty-one".