1218322069 has 4 divisors (see below), whose sum is σ = 1219623244. Its totient is φ = 1217020896.

The previous prime is 1218322031. The next prime is 1218322081. The reversal of 1218322069 is 9602238121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9602238121 = 7 ⋅1371748303.

It can be written as a sum of positive squares in 2 ways, for example, as 692216100 + 526105969 = 26310^2 + 22937^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218322069 - 2⁷ = 1218321941 is a prime.

It is a super-2 number, since 2×1218322069² = 2968617327624881522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218322169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649182 + ... + 651055.

It is an arithmetic number, because the mean of its divisors is an integer number (304905811).

Almost surely, 2^1218322069 is an apocalyptic number.

It is an amenable number.

1218322069 is a deficient number, since it is larger than the sum of its proper divisors (1301175).

1218322069 is an equidigital number, since it uses as much as digits as its factorization.

1218322069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301174.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 1218322069 is about 34904.4706162406. The cubic root of 1218322069 is about 1068.0396367737.

The spelling of 1218322069 in words is "one billion, two hundred eighteen million, three hundred twenty-two thousand, sixty-nine".