228161191 has 2 divisors, whose sum is σ = 228161192. Its totient is φ = 228161190.

The previous prime is 228161189. The next prime is 228161221. The reversal of 228161191 is 191161822.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 228161191 - 2¹ = 228161189 is a prime.

Together with 228161189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228161161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114080595 + 114080596.

It is an arithmetic number, because the mean of its divisors is an integer number (114080596).

Almost surely, 2^228161191 is an apocalyptic number.

228161191 is a deficient number, since it is larger than the sum of its proper divisors (1).

228161191 is an equidigital number, since it uses as much as digits as its factorization.

228161191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 31.

The square root of 228161191 is about 15105.0054948682. The cubic root of 228161191 is about 611.0554075202.

The spelling of 228161191 in words is "two hundred twenty-eight million, one hundred sixty-one thousand, one hundred ninety-one".