1218042169 has 2 divisors, whose sum is σ = 1218042170. Its totient is φ = 1218042168.

The previous prime is 1218042149. The next prime is 1218042193. The reversal of 1218042169 is 9612408121.

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., 1024832169 + 193210000 = 32013^2 + 13900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218042169 - 2⁷ = 1218042041 is a prime.

It is a super-2 number, since 2×1218042169² = 2967253450924449122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1218042149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609021084 + 609021085.

It is an arithmetic number, because the mean of its divisors is an integer number (609021085).

Almost surely, 2^1218042169 is an apocalyptic number.

It is an amenable number.

1218042169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218042169 is an equidigital number, since it uses as much as digits as its factorization.

1218042169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1218042169 is about 34900.4608708825. The cubic root of 1218042169 is about 1067.9578392485.

The spelling of 1218042169 in words is "one billion, two hundred eighteen million, forty-two thousand, one hundred sixty-nine".