1228218229 has 4 divisors (see below), whose sum is σ = 1403677984. Its totient is φ = 1052758476.

The previous prime is 1228218221. The next prime is 1228218253. The reversal of 1228218229 is 9228128221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1228218229 - 2³ = 1228218221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228218221) 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 in 3 ways as a sum of consecutive naturals, for example, 87729867 + ... + 87729880.

It is an arithmetic number, because the mean of its divisors is an integer number (350919496).

Almost surely, 2^1228218229 is an apocalyptic number.

It is an amenable number.

1228218229 is a deficient number, since it is larger than the sum of its proper divisors (175459755).

1228218229 is an equidigital number, since it uses as much as digits as its factorization.

1228218229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175459754.

The product of its digits is 18432, while the sum is 37.

The square root of 1228218229 is about 35045.9445442693. The cubic root of 1228218229 is about 1070.9236584321.

The spelling of 1228218229 in words is "one billion, two hundred twenty-eight million, two hundred eighteen thousand, two hundred twenty-nine".