228491969 has 2 divisors, whose sum is σ = 228491970. Its totient is φ = 228491968.

The previous prime is 228491941. The next prime is 228492001. The reversal of 228491969 is 969194822.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210105025 + 18386944 = 14495^2 + 4288^2 .

It is a cyclic number.

It is not a de Polignac number, because 228491969 - 2¹² = 228487873 is a prime.

It is a super-2 number, since 2×228491969² = 104417159794993922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228491369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114245984 + 114245985.

It is an arithmetic number, because the mean of its divisors is an integer number (114245985).

Almost surely, 2^228491969 is an apocalyptic number.

It is an amenable number.

228491969 is a deficient number, since it is larger than the sum of its proper divisors (1).

228491969 is an equidigital number, since it uses as much as digits as its factorization.

228491969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 228491969 is about 15115.9508136273. The cubic root of 228491969 is about 611.3505586319.

The spelling of 228491969 in words is "two hundred twenty-eight million, four hundred ninety-one thousand, nine hundred sixty-nine".