1216215115 has 8 divisors (see below), whose sum is σ = 1486995408. Its totient is φ = 954613920.

The previous prime is 1216215089. The next prime is 1216215127. The reversal of 1216215115 is 5115126121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216215115 - 2⁹ = 1216214603 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 1216215115.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2294481 + ... + 2295010.

It is an arithmetic number, because the mean of its divisors is an integer number (185874426).

Almost surely, 2^1216215115 is an apocalyptic number.

1216215115 is a deficient number, since it is larger than the sum of its proper divisors (270780293).

1216215115 is an equidigital number, since it uses as much as digits as its factorization.

1216215115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4589549.

The product of its digits is 600, while the sum is 25.

The square root of 1216215115 is about 34874.2758347754. The cubic root of 1216215115 is about 1067.4235958238.

It can be divided in two parts, 121621 and 5115, that added together give a square (126736 = 356²).

The spelling of 1216215115 in words is "one billion, two hundred sixteen million, two hundred fifteen thousand, one hundred fifteen".