1218218619 has 4 divisors (see below), whose sum is σ = 1624291496. Its totient is φ = 812145744.

The previous prime is 1218218597. The next prime is 1218218653. The reversal of 1218218619 is 9168128121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1218218619 - 2¹⁵ = 1218185851 is a prime.

It is a super-2 number, since 2×1218218619² = 2968113207356534322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218218119) 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, 203036434 + ... + 203036439.

It is an arithmetic number, because the mean of its divisors is an integer number (406072874).

Almost surely, 2^1218218619 is an apocalyptic number.

1218218619 is a deficient number, since it is larger than the sum of its proper divisors (406072877).

1218218619 is an equidigital number, since it uses as much as digits as its factorization.

1218218619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406072876.

The product of its digits is 13824, while the sum is 39.

The square root of 1218218619 is about 34902.9886829194. The cubic root of 1218218619 is about 1068.0094061720.

The spelling of 1218218619 in words is "one billion, two hundred eighteen million, two hundred eighteen thousand, six hundred nineteen".