1218222229 has 4 divisors (see below), whose sum is σ = 1392253984. Its totient is φ = 1044190476.

The previous prime is 1218222223. The next prime is 1218222233. The reversal of 1218222229 is 9222228121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9222228121 = 173 ⋅53307677.

It is not a de Polignac number, because 1218222229 - 2⁵ = 1218222197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218222229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218222223) 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 in 3 ways as a sum of consecutive naturals, for example, 87015867 + ... + 87015880.

It is an arithmetic number, because the mean of its divisors is an integer number (348063496).

Almost surely, 2^1218222229 is an apocalyptic number.

It is an amenable number.

1218222229 is a deficient number, since it is larger than the sum of its proper divisors (174031755).

1218222229 is an equidigital number, since it uses as much as digits as its factorization.

1218222229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174031754.

The product of its digits is 4608, while the sum is 31.

The square root of 1218222229 is about 34903.0403976502. The cubic root of 1218222229 is about 1068.0104611304.

The spelling of 1218222229 in words is "one billion, two hundred eighteen million, two hundred twenty-two thousand, two hundred twenty-nine".