228413891 has 2 divisors, whose sum is σ = 228413892. Its totient is φ = 228413890.

The previous prime is 228413881. The next prime is 228413917. The reversal of 228413891 is 198314822.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228413891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228413881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114206945 + 114206946.

It is an arithmetic number, because the mean of its divisors is an integer number (114206946).

Almost surely, 2^228413891 is an apocalyptic number.

228413891 is a deficient number, since it is larger than the sum of its proper divisors (1).

228413891 is an equidigital number, since it uses as much as digits as its factorization.

228413891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 228413891 is about 15113.3679568784. The cubic root of 228413891 is about 611.2809158240.

The spelling of 228413891 in words is "two hundred twenty-eight million, four hundred thirteen thousand, eight hundred ninety-one".